publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2010-04-23 | Metal-insulator transition and the Pr$^{3+}$/Pr$^{4+}$ valence shift in (Pr$_{1-y}$Y$_{y}$)$_{0.7}$Ca$_{0.3}$CoO$_3$ | The magnetic, electric and thermal properties of the
($Ln_{1-y}$Y$_{y}$)$_{0.7}$Ca$_{0.3}$CoO$_3$ perovskites ($Ln$~=~Pr, Nd) were
investigated down to very low temperatures. The main attention was given to a
peculiar metal-insulator transition, which is observed in the praseodymium
based samples with $y=0.075$ and 0.1... | 1004.4100v2 |
2010-07-07 | The Chemical Evolution of the Monoceros Ring/Galactic Anticenter Stellar Structure | The origin of the Galactic Anticenter Stellar Structure (GASS) or "Monoceros
ring" --- a low latitude overdensity at the edge of the Galactic disk spanning
at least the second and third Galactic quadrants --- remains controversial.
Models for the origin of GASS fall generally into scenarios where it is either
a part (e... | 1007.1056v1 |
2010-09-17 | First-principles studies of Ce-doped RE2M2O7 (RE=Y,La;M=Ti,Zr,Hf): A class of non-scintillators | Lanthanum and yttrium compounds with composition RE2M2O7 (RE=Y, La; M = Ti,
Zr, Hf) have high density and high Z and can be doped with Ce onto the La and Y
sites. This makes these compounds good candidates for Ce activated scintillator
gamma-ray detectors particularly for the hafnate systems which have a very high
dens... | 1009.3381v1 |
2010-12-05 | The solar photospheric abundance of zirconium | Zirconium (Zr), together with strontium and yttrium, is an important element
in the understanding of the Galactic nucleosynthesis. In fact, the triad
Sr-Y-Zr constitutes the first peak of s-process elements. Despite its general
relevance not many studies of the solar abundance of Zr were conducted. We
derive the zircon... | 1012.1038v1 |
2011-06-06 | Protons in lattice confinement: Static pressure on the Y-substituted, hydrated BaZrO3 ceramic proton conductor decreases proton mobility | Yttrium substituted BaZrO3, with nominal composition BaZr0.9Y0.1O3, a ceramic
proton conductor, was subject to impedance spectroscopy for temperatures 300 K
< T < 715 K at mechanical pressures 1 GPa < p < 2 GPa. The activation energies
Ea of bulk and grain boundary conductivity from two perovskites synthesized by
solid... | 1106.1091v1 |
2012-05-11 | Novel multifunctional 90Y-labelled albumin magnetic microspheres for cancer therapy | We present in vitro and in vivo studies of yttrium-90 (90Y)-labelled human
serum albumin magnetic microspheres (HSAMMS) as multifunctional agent for
bimodal radionuclide-hyperthermia cancer therapy. The HSAMMS were produced
using a modified emulsification-heat stabilization technique and contained
10-nm magnetite nanop... | 1205.2440v1 |
2013-07-17 | Temperature-driven Phase Transformation in Y_3Co: Neutron Scattering and First-principles Studies | Contrary to previous studies that identified the ground state crystal
structure of the entire R_3Co series (R is a rare earth) as orthorhombic Pnma,
we show that Y_3Co undergoes a structural phase transition at T_t=160K. Single
crystal neutron diffraction data reveal that at T_t the trigonal prisms formed
by a cobalt a... | 1307.4736v1 |
2013-07-18 | Numerical response of the magnetic permeability as a funcion of the frecuency of NiZn ferrites using Genetic Algorithm | The magnetic permeability of a ferrite is an important factor in designing
devices such as inductors, transformers, and microwave absorbing materials
among others. Due to this, it is advisable to study the magnetic permeability
of a ferrite as a function of frequency.
When an excitation that corresponds to a harmonic... | 1307.5007v1 |
2013-08-12 | Diamond Magnetometry of Superconducting Thin Films | In recent years diamond magnetometers based on the nitrogen-vacancy (NV)
center have been of considerable interest for magnetometry applications at the
nanoscale. An interesting application which is well suited for NV centers is
the study of nanoscale magnetic phenomena in superconducting materials. We
employ the magne... | 1308.2689v3 |
2014-01-22 | Dzyaloshinskii-Moriya nature of ferroelectric ordering in magnetoelectric Gd$_{1-x}$Y$_{x}$MnO$_{3}$ system | This work reports on magnetic, dielectric, thermodynamic and magnetoelectric
properties of Gd$_{1-x}$Y$_{x}$MnO$_{3}$, with 0 \leq x \leq 0.4, with emphasis
on the (x, T) phase diagram, towards unraveling the role of the driving
mechanisms in stabilizing both magnetic and ferroelectric orderings. The (x, T)
phase diagr... | 1401.5718v2 |
2014-01-29 | Nucleosynthesis in helium-enriched asymptotic giant branch models: Implications for Heavy Element Enrichment in Omega Centauri | We investigate the effect of helium enrichment on the evolution and
nucleosynthesis of low-mass asymptotic giant branch (AGB) stars of 1.7Msun and
2.36Msun with a metallicity of Z=0.0006 ([Fe/H] = -1.4). We calculate
evolutionary sequences with the primordial helium abundance (Y = 0.24) and with
helium-enriched composi... | 1401.7479v1 |
2014-03-19 | Pt-based nanowire networks with enhanced oxygen-reduction activity | Pt-Al and Pt-Y-Al thin film electrodes on yttria-stabilised zirconia
electrolytes were prepared by dealloying of co-sputtered Pt-Al or Pt-Y-Al
films. The selective dissolution of Al from the Pt-alloy compound causes the
formation of a highly porous nanowire network with a mean branch thickness
below 25 nm and a pore in... | 1403.4665v4 |
2014-05-23 | Proof-of-principle of a new geometry for sampling calorimetry using inorganic scintillator plates | A novel geometry for a sampling calorimeter employing inorganic scintillators
as an active medium is presented. To overcome the mechanical challenges of
construction, an innovative light collection geometry has been pioneered, that
minimises the complexity of construction. First test results are presented,
demonstratin... | 1405.6202v1 |
2014-07-29 | Discovery of extremely lead-rich subdwarfs: does heavy metal signal the formation of subdwarf B stars? | Hot subdwarfs represent a group of low-mass helium-burning stars formed
through binary-star interactions and include some of the most
chemically-peculiar stars in the Galaxy. Stellar evolution theory suggests that
they should have helium-rich atmospheres but, because radiation causes hydrogen
to diffuse upwards, a majo... | 1407.7668v1 |
2015-04-28 | High-precision abundances of elements in solar twin stars: Trends with stellar age and elemental condensation temperature | HARPS spectra with S/N > 600 for 21 solar twin stars are used to determine
very precise (sigma ~ 0.01 dex) differential abundances of C, O, Na, Mg, Al,
Si, S, Ca, Ti, Cr, Fe, Ni, Zn, and Y in order to see how well [X/Fe] is
correlated with elemental condensation temperature, Tc. In addition, precise
(sigma < 0.8 Gyr) s... | 1504.07598v1 |
2015-06-18 | Short intense ion pulses for materials and warm dense matter research | We have commenced experiments with intense short pulses of ion beams on the
Neutralized Drift Compression Experiment-II at Lawrence Berkeley National
Laboratory, by generating beam spots size with radius r < 1 mm within 2 ns FWHM
and approximately 10^10 ions/pulse. To enable the short pulse durations and
mm-scale focal... | 1506.05839v1 |
2015-09-15 | Measurement of time resolution of the Mu2e LYSO calorimeter prototype | In this paper we present the time resolution measurements of the
Lutetium-Yttrium Oxyorthosilicate (LYSO) calorimeter prototype for the Mu2e
experiment. The measurements have been performed using the $e^-$ beam of the
Beam Test Facility (BTF) in Frascati, Italy in the energy range from 100 to 400
MeV. The calorimeter p... | 1509.04468v2 |
2015-11-16 | The evolved pulsating CEMP star HD112869 | Radial velocity measurements, $BVR_C$ photometry, and high-resolution
spectroscopy in the wavelength region from blue to near infrared are employed
in order to clarify the evolutionary status of the carbon-enhanced metal-poor
star HD112869 with unique ratio of carbon isotopes in the atmosphere. An LTE
abundance analysi... | 1511.04953v2 |
2016-02-18 | Hole-doping-induced melting of spin-state ordering in PrBaCo2O5.5+x | The layered perovskite cobaltite RBaCo$_2$O$_{5.5}$ (R: rare-earth elements
or Yttrium) exhibits an abrupt temperature-induced metal$-$insulator transition
(MIT) and has been attributed to spin-state ordering (SSO) of Co$^{3+}$ ions.
Here we investigated the hole doping member of PrBaCo$_2$O$_{5.5+x}$ ($0 \le x
\le 0.2... | 1602.05687v2 |
2016-03-22 | Polaronic contributions to oxidation and hole conductivity in acceptor-doped BaZrO$_3$ | Acceptor-doped perovskite oxides like BaZrO$_3$ are showing great potential
as materials for renewable energy technologies where hydrogen acts an energy
carrier, such as solid oxide fuel cells and hydrogen separation membranes.
While ionic transport in these materials has been investigated intensively, the
electronic c... | 1603.06728v2 |
2017-01-20 | Ultrafast X-ray Diffraction Thermometry Measures the Influence of Spin Excitations on the Heat Transport through nanolayers | We investigate the heat transport through a rare earth multilayer system
composed of Yttrium (Y), Dysprosium (Dy) and Niobium (Nb) by ultrafast X-ray
diffraction. This is an example of a complex heat flow problem on the
nanoscale, where several different quasi-particles carry the heat. The Bragg
peak positions of each ... | 1701.05918v1 |
2017-10-24 | Hyperfine interactions of $\text{Er}^{3+}$ ions in $\text{Y}_2\text{SiO}_{5}$: electron paramagnetic resonance in a tunable microwave cavity | The hyperfine structure of the ground state of erbium doped yttrium
orthosilicate is analyzed with the use of electron paramagnetic resonance
experiments in a tunable microwave resonator. This work was prompted by the
disagreement between the measurements made in zero magnetic field [Phys. Rev.
B, 94, 075117, (2016)] a... | 1710.09014v2 |
2017-11-06 | A Raman-Heterodyne Study of the Hyperfine Interaction of the Optically-Excited State $^5$D$_0$ of Eu$^{3+}$:Y$_2$SiO$_5$ | The spin coherence time of $^{151}$Eu$^{3+}$ which substitutes the yttrium at
site 1 in Y$_2$SiO$_5$ crystal has been extended to 6 hours in a recent work
[\textit{Nature} \textbf{517}, 177 (2015)]. To make this long-lived spin
coherence useful for optical quantum memory applications, we experimentally
characterize the... | 1711.01814v2 |
2017-11-16 | Anisotropy and phonon modes from analysis of the dielectric function tensor and inverse dielectric function tensor of monoclinic yttrium orthosilicate | We determine the frequency dependence of the four independent Cartesian
tensor elements of the dielectric function for monoclinic symmetry Y$_2$SiO$_5$
using generalized spectroscopic ellipsometry from 40-1200 cm$^{-1}$. Three
different crystal cuts, each perpendicular to a principle axis, are
investigated. We apply ou... | 1711.06336v1 |
2017-12-29 | Origins and dissociation of pyramidal <c + a> dislocations in magnesium and its alloys | Alloying magnesium (Mg) with rare earth elements such as yttrium (Y) has been
reported to activate the pyramidal <c + a> slip systems and improve the
plasticity of Mg at room temperature. However, the origins of such dislocations
and their dissociation mechanisms remain poorly understood. Here, we
systematically invest... | 1712.10098v1 |
2018-01-10 | Study of a Prototype VP-PET Imaging System Based on highly Pixelated CdZnTe Detectors | We are investigating a prototype virtual pinhole positron emission tomography
(VP-PET) system for small animal imaging applications. The PET detector modules
were made up of 1.3 mm lutetium-yttrium oxyorthosilicate (LYSO) arrays, and the
insert detectors consists of 0.6 mm pixelated Cadmium Zinc Telluride (CdZnTe).
To ... | 1801.03225v1 |
2018-01-11 | Nano-machining, surface analysis and emittance measurements of a copper photocathode at SPARC_LAB | R\&D activity on Cu photocathodes is under development at the SPARC\_LAB test
facility to fully characterize each stage of the photocathode "life" and to
have a complete overview of the photoemission properties in high brightness
photo-injectors. The nano(n)-machining process presented here consists in
diamond milling,... | 1801.03823v1 |
2018-02-17 | Controlling rare-earth ions in a nanophotonic resonator using the ac Stark shift | On-chip nanophotonic cavities will advance quantum information science and
measurement because they enable efficient interaction between photons and
long-lived solid-state spins, such as those associated with rare-earth ions in
crystals. The enhanced photon-ion interaction creates new opportunities for
all-optical cont... | 1802.06172v1 |
2018-03-05 | Widefield imaging of superconductor vortices with electron spins in diamond | Understanding the mechanisms behind high-$T_{c}$ Type-II superconductors (SC)
is still an open task in condensed matter physics. One way to gain further
insight into the microscopic mechanisms leading to superconductivity is to
study the magnetic properties of the SC in detail, for example by studying the
properties of... | 1803.01957v1 |
2018-08-22 | Evidence against anomalous compositions for giants in the Galactic Nuclear Star Cluster | Very strong Sc I lines have been found recently in cool M giants in the
Nuclear Star Cluster in the Galactic Center. Interpreting these as anomalously
high scandium abundances in the Galactic Center would imply a unique
enhancement signature and chemical evolution history for nuclear star clusters,
and a potential test... | 1808.07489v1 |
2018-11-21 | Position Sensitive Alpha Detector for an Associate Particle Imaging System | Associated Particle Imaging (API) is a nuclear technique that allows for the
nondestructive determination of 3D isotopic distributions. The technique is
based on the detection of the alpha particles associated with the neutron
emitted in the deuterium-tritium (DT) fusion reaction, which provides
information regarding t... | 1811.08591v1 |
2019-02-12 | High Quality Factor High-Temperature Superconducting Microwave Cavity Development for the Dark Matter Axion Search in a Strong Magnetic Field | We demonstrate a superconducting (SC) microwave (mw) cavity that can
accelerate the dark matter search by maintaining superconductivity in a high DC
magnetic field. We used high-temperature superconductor (HTSC) yttrium barium
copper oxide (YBCO) with a phase transition temperature of 90K to prevent SC
failure by the m... | 1902.04551v3 |
2019-03-04 | Ionization-density-dependent Scintillation Pulse Shape and Mechanism of Luminescence Quenching in LaBr3:Ce | Pulse-shape discrimination (PSD) is usually achieved using the different fast
and slow decay components of inorganic scintillators, such as BaF2, CsI:Tl,
etc. However, LaBr3:Ce is considered to not possess different components at
room temperature, but has been proved to have the capability of discriminating
{\gamma} an... | 1903.01452v3 |
2020-01-26 | The Spectral and Magnetic Properties of Er$^{3+}$ and Yb$^{3+}$ Ions in Y$_{2}$Ti$_{2}$O$_{7}$ Crystals with a Pyrochlore Structure | Cubic Y$_{2}$Ti$_{2}$O$_{7}$ single crystals doped with Er$^{3+}$ and
Yb$^{3+}$ ions have been studied by the methods of electron spin resonance
(ESR) and selective laser spectroscopy. ESR spectra exhibit signals from
rare-earth ions that substitute for yttrium ions in sites with local trigonal
symmetry. The $g$ tensor... | 2001.09447v1 |
2020-02-20 | Reliable coherent optical memory based on a laser-written waveguide | $\mathrm {^{151}Eu^{3+}}$-doped yttrium silicate ($\mathrm
{^{151}Eu^{3+}:Y_2SiO_5}$ ) crystal is a unique material that possesses
hyperfine states with coherence time up to 6 h. Many efforts have been devoted
to the development of this material as optical quantum memories based on the
bulk crystals, but integrable str... | 2002.08780v1 |
2020-02-21 | Sensing individual nuclear spins with a single rare-earth electron spin | Rare-earth related electron spins in crystalline hosts are unique material
systems, as they can potentially provide a direct interface between telecom
band photons and long-lived spin quantum bits. Specifically, their optically
accessible electron spins in solids interacting with nuclear spins in their
environment are ... | 2002.09357v2 |
2020-04-06 | Successful production of Solution Blow Spun YBCO+Ag complex ceramics | YBCO fabrics composed of nanowires, produced by solution blow spinning (SBS)
are so brittle that the Lorentz force produced by induced currents can be
strong enough to damage them. On the other hand, it is known that silver
addition improves the mechanical and flux pinning properties of ceramic
superconductors. Thus, i... | 2004.07287v2 |
2020-04-15 | Experimental observation of magnetic dimers in diluted Yb:YAlO$_3$ | We present a comprehensive experimental investigation of Yb magnetic dimers
in Yb$_{0.04}$Y$_{0.96}$AlO$_3$, an Yb-doped Yttrium Aluminum Perovskite (YAP)
YAlO$_3$ by means of specific heat, magnetization and high-resolution inelastic
neutron scattering (INS) measurements. In our sample, the Yb ions are randomly
distri... | 2004.07325v1 |
2020-04-28 | Al-dependent electronic and magnetic properties of YCrO$_3$ with magnetocaloric application: an ab-initio and Monte-Carlo approach | In this paper, a theoretical journey from electronic to magneto-caloric
effect has been shown through the magnetic properties of aluminium induced
yttrium chromate. The ground state electronic band structure and density of
states have been studied using first principle calculations under GGA+U
schemes. From the energy ... | 2004.13456v2 |
2020-05-21 | Local distortions and dynamics in hydrated Y-doped BaZrO$_3$ | Y-doped BaZrO$_3$ is a promising proton conductor for intermediate
temperature solid oxide fuel cells. In this work, a combination of static DFT
calculations and DFT based molecular dynamics (DFT-MD) was used to study proton
conduction in such a material. Geometry optimisations of 100 structures with a
12.5% dopant con... | 2005.10877v1 |
2020-09-14 | An all-digital associated particle imaging system for the 3D determination of isotopic distributions | Associated particle imaging (API) is a non-destructive nuclear technique for
the 3D determination of isotopic distributions. By detecting the alpha particle
associated with the emitted neutron in the deuterium-tritium fusion reaction
with a position- and time-resolving detector, the direction of the 14.1 MeV
neutron an... | 2009.06768v2 |
2020-11-15 | A single-projection three-dimensional reconstruction algorithm for scanning transmission electron microscopy data | Increasing interest in three-dimensional nanostructures adds impetus to
electron microscopy techniques capable of imaging at or below the nanoscale in
three dimensions. We present a reconstruction algorithm that takes as input a
focal series of four-dimensional scanning transmission electron microscopy
(4D-STEM) data. ... | 2011.07652v2 |
2020-12-09 | Kinetically-stabilized Ferroelectricity in Bulk Singlecrystalline HfO2:Y without Wake-up Effects | HfO2, a simple binary oxide, holds ultra-scalable ferroelectricity integrable
into silicon technology. Polar orthorhombic (Pbc21) form in ultra-thin-films
ascribes as the plausible root-cause of the astonishing ferroelectricity, which
has thought not attainable in bulk crystals. Though, perplexities remain
primarily du... | 2012.05289v1 |
2021-02-08 | Improvement of reversible H storage capacity by fine tuning of the composition in the pseudo-binary systems A2-xLaxNi7 (A = Gd, Sm, Y, Mg) | A2B7 compounds (A = rare earth or Mg, B = transition metal) are widely
studied as active materials for negative electrode in Ni-MH batteries. By
playing on the substitution rate of both A and B elements, it is possible to
prepare various compositions. This strategy will help to improve the
properties, for example get a... | 2102.04161v1 |
2021-03-06 | Spectroscopic Evidence for the Superconductivity of Elemental Metal Y under Pressure | Very high applied pressure induces superconductivity with the transition
temperature ($T_c$) exceeding 19 K in elemental yttrium, but relatively little
is known about the nature of that superconductivity. From point-contact
spectroscopy (PCS) measurements in a diamond anvil cell (DAC), a strong
enhancement in the diffe... | 2103.04070v3 |
2021-03-18 | An antisite defect mechanism for room temperature ferroelectricity in orthoferrites | Single-phase multiferroic materials that allow the coexistence of
ferroelectric and magnetic ordering above room temperature are highly
desirable, motivating an ongoing search for mechanisms for unconventional
ferroelectricity in magnetic oxides. Here, we report an antisite defect
mechanism for room temperature ferroel... | 2103.10338v1 |
2021-06-08 | Superconducting microresonators for electron spin resonance, the good, the bad, and the future | The field of electron spin resonance is in constant need to improve its
capabilities. Among other things, this means having better resonators which
would provide improved spin sensitivity, as well as enable larger microwave
magnetic field power conversion factors. Surface micro resonators, made of
small metallic patche... | 2106.04163v2 |
2021-08-29 | Nuclear spin-wave quantum register for a solid state qubit | Solid-state nuclear spins surrounding individual, optically addressable
qubits provide a crucial resource for quantum networks, computation and
simulation. While hosts with sparse nuclear spin baths are typically chosen to
mitigate qubit decoherence, developing coherent quantum systems in nuclear
spin-rich hosts enable... | 2108.12723v1 |
2021-09-11 | Dzyaloshinskii interaction and exchange-relativistic effects in orthoferrites | We present an overview of the microscopic theory of the Dzyaloshinskii-Moriya
(DM) coupling and related exchange-relativistic effects such as exchange
anisotropy, electron-nuclear antisymmetric supertransferred hyperfine
interactions, antisymmetric magnetogyrotropic effects, and antisymmetric
magnetoelectric coupling i... | 2109.05326v1 |
2021-11-20 | Trivalent ion overcharging on electrified graphene | The structure of the electrical double layer (EDL) formed near graphene in
aqueous environments strongly impacts its performance for a plethora of
applications, including capacitive deionization. In particular, adsorption and
organization of multivalent counterions near the graphene interface can promote
nonclassical b... | 2111.10516v2 |
2021-12-09 | Comparative studies of hydrogen dissolution and release behavior in zirconate oxides by TDS and TMAP4 analysis | Proton-conducting oxides are potential materials for electrochemical devices
such as fuel cells, hydrogen pumps, hydrogen sensors, and the tritium
purification and recovery system in nuclear fusion reactors. The hydrogen
concentration in oxide materials is important, but its precise measurement is
difficult. In this st... | 2112.04649v1 |
2022-07-06 | Robust millisecond coherence times of erbium electron spins | Erbium-doped solids are prime candidates for optical quantum communication
networks due to erbium's telecom C-band emission. A long-lived electron spin of
erbium with millisecond coherence time is highly desirable for establishing
entanglement between adjacent quantum repeater nodes while long-term storage of
the entan... | 2207.02708v1 |
2022-09-15 | Yttrium incorporation in Cr2AlC: On the metastable phase formation and decomposition of (Cr,Y)2AlC MAX phase thin films | Herein we report on the synthesis of a metastable (Cr,Y)2AlC MAX phase solid
solution by co-sputtering from a composite Cr-Al-C and elemental Y target, at
room temperature, followed by annealing. While direct high-temperature
synthesis resulted in multiphase films, as evidenced by X-ray diffraction
analyses, room tempe... | 2209.07119v1 |
2022-11-29 | Comparative Analysis of the Electronic Energy Structure of Nanocrystalline Polymorphs of Y2O3 Thin Layers: Theory and Experiments | The results of fabrication and characterization of atomic structure of
nanocrystalline thin layers of Y2O3 in cubic and monoclinic phases is reported.
Experimental data demonstrate crystalline ordering in nanocrystalline films
with average grain size of ~10-14 nm both for cubic and monoclinic studied
structures. Densit... | 2211.16004v1 |
2023-01-18 | Stripe Symmetry of Short-range Charge Density Waves in Cuprate Superconductors | The omnipresence of charge density waves (CDWs) across almost all cuprate
families underpins a common organizing principle. However, a longstanding
debate of whether its spatial symmetry is stripe or checkerboard remains
unresolved. While CDWs in lanthanum- and yttrium-based cuprates possess a
stripe symmetry, distingu... | 2301.07637v1 |
2023-04-28 | Phantom study for 90Y post-treatment dosimetry with a long axial field-of-view PET/CT | Purpose: The physical properties of yttrium-90 (90Y) allow for imaging with
positron emission tomography/computed tomography (PET/CT). The increased
sensitivity of long axial field-of-view (LAFOV) PET/CT scanners possibly allows
to overcome the small branching ratio for positron production from 90Y decays
and to improv... | 2304.14797v2 |
2023-08-29 | KilonovAE: Exploring Kilonova Spectral Features with Autoencoders | Kilonovae are likely a key site of heavy r-process element production in the
Universe, and their optical/infrared spectra contain insights into both the
properties of the ejecta and the conditions of the r-process. However, the
event GW170817/AT2017gfo is the only kilonova so far with well-observed
spectra. To understa... | 2308.15657v2 |
2023-09-11 | Topological phase transition and tunable surface states in YBi | A unique co-existence of extremely large magnetoresistance (XMR) and
topological characteristics in non-magnetic rare-earth monopnictides
stimulating intensive research on these materials. Yttrium monobismuthide (YBi)
has been reported to exhibit XMR up to 105% but its Topological properties
still need clarification. H... | 2309.05553v1 |
2023-12-12 | Origin of correlated diffuse scattering in the hexagonal manganites | We use a combination of first-principles density functional calculations and
spin-dynamics simulations to explain the unusual diffuse inelastic neutron
scattering in the hexagonal multiferroic yttrium manganite, YMnO$_3$. Using
symmetry considerations, we construct a model spin Hamiltonian with parameters
derived from ... | 2312.07449v2 |
2023-12-21 | The Numerical Equivalence of Diabatic and Adiabatic Representations in Diatomic Molecules | The (stationary) Schr\"{o}dinger equation for atomistic systems is solved
using the adiabatic potential energy curves (PECs) and the associated adiabatic
approximation. Despite being very simplistic, this approach is very powerful
and used in nearly all practical applications. In cases when interactions
between electro... | 2312.13895v1 |
2024-01-24 | 3D NLTE modelling of Y and Eu. Centre-to-limb variation and solar abundances | Context. Abundances of s- and r-process elements in Sun-like stars constrain
nucleosynthesis in extreme astrophysical events, such as compact binary mergers
and explosions of highly magnetised rapidly rotating massive stars.
Aims. We measure solar abundances of yttrium (Y) and europium (Eu) using 3D
non-local thermal... | 2401.13450v1 |
2024-01-26 | Engineering strong magnetoelectricity using a hexagonal 2D material on electron-doped hexagonal LuFeO$_3$ | Cubic perovskite-structure ABO$_3$ and A$_{1-x}$A$^{\prime}$$_x$BO$_3$-type
oxides have been investigated extensively while their hexagonal-structure
versions have received minimal attention, even though they are multiferroic and
can form heterostructures with the manifold hexagonal two-dimensional
materials. Hexagonal... | 2401.15053v1 |
2006-12-14 | On Site Raman Analysis of Iznik Pottery Glazes and Pigments | On site Raman analyses were performed at the Mus\'{e}e national de
C\'{e}ramique, S\`{e}vres, France, on rare Iznik (former Nicaea) pottery
produced from ~1480 to ~1620. A comparison is made with a series of shards. The
town of production of these potteries was highly disputed in the 80's and many
questions still remai... | 0612375v1 |
2006-01-24 | Trapping atoms on a transparent permanent-magnet atom chip | We describe experiments on trapping of atoms in microscopic magneto-optical
traps on an optically transparent permanent-magnet atom chip. The chip is made
of magnetically hard ferrite-garnet material deposited on a dielectric
substrate. The confining magnetic fields are produced by miniature magnetized
patterns recorde... | 0601163v2 |
2008-10-14 | Field induced magnetic order in the frustrated magnet Gadolinium Gallium Garnet | Gd3Ga5O12, (GGG), has an extraordinary magnetic phase diagram, where no long
range order is found down to 25 mK despite \Theta_CW \approx 2 K. However, long
range order is induced by an applied field of around 1 T. Motivated by recent
theoretical developments and the experimental results for a closely related
hyperkago... | 0810.2410v1 |
2010-08-06 | Photon Self-Induced Spin to Orbital Conversion in TGG crystal at high laser power | In this paper, we present experimental evidence of a newly discovered
third-order nonlinear optical process Self-Induced Spin-to-Orbital Conversion
(SISTOC) of the photon angular momentum. This effect is the physical mechanism
at the origin of the depolarization of very intense laser beams propagating in
isotropic mate... | 1008.1283v1 |
2011-08-03 | Optimizing large parameter sets in variational quantum Monte Carlo | We present a technique for optimizing hundreds of thousands of variational
parameters in variational quantum Monte Carlo. By introducing iterative Krylov
subspace solvers and by multiplying by the Hamiltonian and overlap matrices as
they are sampled, we remove the need to construct and store these matrices and
thus byp... | 1108.0900v1 |
2012-03-08 | Truncated Configuration Interaction expansions as solvers for correlated quantum impurity models and dynamical mean field theory | The development of polynomial cost solvers for correlated quantum impurity
models, with controllable errors, is a central challenge in quantum many-body
physics, where these models find applications ranging from nano-science to the
dynamical mean-field theory (DMFT). Here we describe how configuration
interaction (CI) ... | 1203.1914v1 |
2013-02-10 | Efficient Tree Tensor Network States (TTNS) for Quantum Chemistry: Generalizations of the Density Matrix Renormalization Group Algorithm | We investigate tree tensor network states for quantum chemistry. Tree tensor
network states represent one of the simplest generalizations of matrix product
states and the density matrix renormalization group. While matrix product
states encode a one-dimensional entanglement structure, tree tensor network
states encode ... | 1302.2298v2 |
2013-05-08 | The Thouless theorem for matrix product states and subsequent post-density matrix renormalization group methods | The similarities between Hartree-Fock (HF) theory and the density-matrix
renormalization group (DMRG) are explored. Both methods can be formulated as
the variational optimization of a wave-function ansatz. Linearization of the
time-dependent variational principle near a variational minimum allows to
derive the random p... | 1305.1761v3 |
2013-09-09 | Spectral functions of strongly correlated extended systems via an exact quantum embedding | Density matrix embedding theory (DMET) [Phys. Rev. Lett., 109, 186404
(2012)], introduced a new approach to quantum cluster embedding methods,
whereby the mapping of strongly correlated bulk problems to an impurity with
finite set of bath states was rigorously formulated to exactly reproduce the
entanglement of the gro... | 1309.2320v2 |
2014-03-12 | Projector quantum Monte Carlo with matrix product states | We marry tensor network states (TNS) and projector quantum Monte Carlo (PMC)
to overcome the high computational scaling of TNS and the sign problem of PMC.
Using TNS as trial wavefunctions provides a route to systematically improve the
sign structure and to eliminate the bias in fixed-node and constrained-path
PMC. As ... | 1403.3125v2 |
2014-08-21 | A spin-adapted Density Matrix Renormalization Group algorithm for quantum chemistry | We extend the spin-adapted density matrix renormalization group (DMRG)
algorithm of McCulloch and Gulacsi [Europhys. Lett.57, 852 (2002)] to quantum
chemical Hamiltonians. This involves two key modifications to the
non-spin-adapted DMRG algorithm: the use of a quasi-density matrix to ensure
that the renormalised DMRG s... | 1408.5039v1 |
2014-08-21 | Spectroscopic accuracy directly from quantum chemistry: application to ground and excited states of beryllium dimer | We combine explicit correlation via the canonical transcorrelation approach
with the density matrix renormalization group and initiator full configuration
interaction quantum Monte Carlo methods to compute a near-exact beryllium dimer
curve, {\it without} the use of composite methods. In particular, our direct
density ... | 1408.5090v1 |
2015-12-16 | Hilbert space renormalization for the many-electron problem | Renormalization is a powerful concept in the many-body problem. Inspired by
the highly successful density matrix renormalization group (DMRG) algorithm,
and the quantum chemical graphical representation of configuration space, we
introduce a new theoretical tool: Hilbert space renormalization, to describe
many-electron... | 1512.05218v1 |
2016-03-21 | From plane waves to local Gaussians for the simulation of correlated periodic systems | We present a simple, robust and black-box approach to the implementation and
use of local, periodic, atom-centered Gaussian basis functions within a plane
wave code, in a computationally efficient manner. The procedure outlined is
based on the representation of the Gaussians within a finite bandwidth by their
underlyin... | 1603.06457v3 |
2016-04-05 | Simulation of White Light Generation and Near Light Bullets Using a Novel Numerical Technique | An accurate and efficient simulation has been devised, employing a new
numerical technique to simulate the derivative generalised non-linear
Schr\"odinger equation in all three spatial dimensions and time. The simulation
models all pertinent effects such as self-steepening and plasma for the
non-linear propagation of u... | 1604.01140v3 |
2016-05-09 | Matrix Product Operators, Matrix Product States, and ab initio Density Matrix Renormalization Group algorithms | Current descriptions of the ab initio DMRG algorithm use two superficially
different languages: an older language of the renormalization group and
renormalized operators, and a more recent language of matrix product states and
matrix product operators. The same algorithm can appear dramatically different
when written i... | 1605.02611v2 |
2016-07-05 | Transport and selective chaining of bidisperse particles in a travelling wave potential | We combine experiments, theory and numerical simulation to investigate the
dynamics of a binary suspension of paramagnetic colloidal particles dispersed
in water and transported above a stripe patterned magnetic garnet film. The
substrate generates a one-dimensional periodic energy landscape above its
surface. The appl... | 1607.01131v1 |
2016-09-24 | A real-time extension of density matrix embedding theory for non-equilibrium electron dynamics | We introduce real-time density matrix embedding theory (DMET), a dynamical
quantum embedding theory for computing non-equilibrium electron dynamics in
strongly correlated systems. As in the previously developed static DMET,
real-time DMET partitions the system into an impurity corresponding to the
region of interest co... | 1609.07678v2 |
2016-10-07 | Polarizers, optical bridges and Sagnac interferometers for nanoradian polarization rotation measurements | The ability to measure nanoradian polarization rotations, $\theta_F$, in the
photon shot noise limit is investigated for partially crossed polarizers (PCP),
a static Sagnac interferometer and an optical bridge, each of which can in
principal be used in this limit with near equivalent figures-of-merit (FOM). In
practice... | 1610.02297v3 |
2016-12-08 | Quantum embedding theories | In complex systems, it is often the case that the region of interest forms
only one part of a much larger system. The idea of joining two different
quantum simulations - a high level calculation on the active region of
interest, and a low level calculation on its environment - formally defines a
quantum embedding. Whil... | 1612.02576v2 |
2017-01-18 | Excitation of magnon accumulation by laser clocking as a source of long-range spin waves in transparent magnetic films | Optical tools are of great promise for generation of spin waves due to the
possibility to manipulate on ultrashort time scales and to provide local
excitation. However, a single laser pulse can inject spin waves only with a
broad frequency spectrum, resulting in a short propagation distance and low
amplitude. Here we e... | 1701.05109v1 |
2017-01-26 | Automated construction of molecular active spaces from atomic valence orbitals | We introduce the atomic valence active space (AVAS), a simple and
well-defined automated technique for constructing active orbital spaces for use
in multi-configuration and multireference (MR) electronic structure
calculations. Concretely, the technique constructs active molecular orbitals
capable of describing all rel... | 1701.07862v2 |
2017-05-01 | Towards the solution of the many-electron problem in real materials: equation of state of the hydrogen chain with state-of-the-art many-body methods | We present numerical results for the equation of state of an infinite chain
of hydrogen atoms. A variety of modern many-body methods are employed, with
exhaustive cross-checks and validation. Approaches for reaching the continuous
space limit and the thermodynamic limit are investigated, proposed, and tested.
The detai... | 1705.01608v2 |
2017-05-31 | Low Depth Quantum Simulation of Electronic Structure | Quantum simulation of the electronic structure problem is one of the most
researched applications of quantum computing. The majority of quantum
algorithms for this problem encode the wavefunction using $N$ Gaussian
orbitals, leading to Hamiltonians with ${\cal O}(N^4)$ second-quantized terms.
We avoid this overhead and... | 1706.00023v3 |
2017-12-19 | Hole self-trapping in the Y3Al5O12 and Lu3Al5O12 garnet crystals | The processes of hole localization in the Y3Al5O12 and Lu3Al5O12 single
crystals were investigated by electron paramagnetic resonance (EPR) and
thermally stimulated luminescence (TSL). It was found that holes created by
x-ray irradiation at 77 K are predominantly self-trapped at regular oxygen ions
forming O- hole cent... | 1712.06928v1 |
2018-03-19 | A Perturbative Density Matrix Renormalization Group Algorithm for Large Active Spaces | We describe a low cost alternative to the standard variational DMRG (density
matrix renormalization group) algorithm that is analogous to the combination of
selected configuration interaction plus perturbation theory (SCI+PT). We denote
the resulting method p-DMRG (perturbative DMRG) to distinguish it from the
standard... | 1803.07150v2 |
2018-05-02 | Pseudo-Goldstone gaps and order-by-quantum-disorder in frustrated magnets | In systems with competing interactions, continuous degeneracies can appear
which are accidental, in that they are not related to any symmetry of the
Hamiltonian. Accordingly, the pseudo-Goldstone modes associated with these
degeneracies are also unprotected. Indeed, through a process known as
"order-by-quantum-disorder... | 1805.00947v2 |
2018-12-12 | Potential jumps at transport bottlenecks cause instability of nominally ionic solid electrolytes in electrochemical cells | Normal operations of electrochemical devices such as solid oxide fuel cells
(SOFC), solid oxide electrolyzer cells (SOEC) and lithium ion batteries (LIB)
sometimes fail because of unexpected formation of internal phases. These phases
include oxygen bubbles at grain boundaries inside the zirconia electrolyte of
SOEC, is... | 1812.05187v5 |
2019-01-23 | Determining eigenstates and thermal states on a quantum computer using quantum imaginary time evolution | The accurate computation of Hamiltonian ground, excited, and thermal states
on quantum computers stands to impact many problems in the physical and
computer sciences, from quantum simulation to machine learning. Given the
challenges posed in constructing large-scale quantum computers, these tasks
should be carried out ... | 1901.07653v3 |
2019-02-21 | Learning representations of irregular particle-detector geometry with distance-weighted graph networks | We explore the use of graph networks to deal with irregular-geometry
detectors in the context of particle reconstruction. Thanks to their
representation-learning capabilities, graph networks can exploit the full
detector granularity, while natively managing the event sparsity and
arbitrarily complex detector geometries... | 1902.07987v2 |
2019-04-17 | Graphene Induced Large Shift of Surface Plasmon Resonances of Gold Films: Effective Medium Theory for Atomically Thin Materials | Despite successful modeling of graphene as a 0.34-nm thick optical film
synthesized by exfoliation or chemical vapor deposition (CVD), graphene induced
shift of surface plasmon resonance (SPR) of gold films has remained
controversial. Here we report the resolution of this controversy by developing
a clean CVD graphene ... | 1904.08308v1 |
2019-05-30 | A Test of Bolometric Properties of Tm-containing Crystals as a Perspective Detector for the Solar Axion Search | The $^{169}$Tm nuclide has first nuclear level at 8.41 keV with magnetic type
transition to the ground state and, therefore, can be used as a target nucleus
for the search of resonant absorption of solar axions. We plan to use a
Tm-containing crystal of a garnet family Tm$_3$Al$_5$O$_{12}$ as a bolometric
detector in o... | 1905.12952v1 |
2019-07-13 | On the generalization of the exponential basis for tensor network representations of long-range interactions in two and three dimensions | In one dimension (1D), a general decaying long-range interaction can be fit
to a sum of exponential interactions $e^{-\lambda r_{ij}}$ with varying
exponents $\lambda$, each of which can be represented by a simple matrix
product operator (MPO) with bond dimension $D=3$. Using this technique,
efficient and accurate simu... | 1907.06018v1 |
2019-08-27 | The relationship between the redox activity and electrochemical stability of solid electrolytes for solid-state batteries | All-solid-state Li-ion batteries promise safer electrochemical energy storage
with larger volumetric and gravimetric energy densities. A major concern is the
limited electrochemical stability of solid electrolytes and related detrimental
electrochemical reactions, especially because of our restricted understanding.
Her... | 1908.10144v1 |
2019-09-30 | Direct comparison of many-body methods for realistic electronic Hamiltonians | A large collaboration carefully benchmarks 20 first principles many-body
electronic structure methods on a test set of 7 transition metal atoms, and
their ions and monoxides. Good agreement is attained between the 3
systematically converged methods, resulting in experiment-free reference
values. These reference values ... | 1910.00045v2 |
2019-10-05 | Electronic structure of bulk manganese oxide and nickel oxide from coupled cluster theory | We describe the ground- and excited-state electronic structure of bulk MnO
and NiO, two prototypical correlated electron materials, using coupled cluster
theory with single and double excitations (CCSD). As a corollary, this work
also reports the first implementation of unrestricted periodic ab initio
equation-of motio... | 1910.02191v2 |
2019-10-18 | Magnetic order and single-ion anisotropy in Tb$_3$Ga$_5$O$_{12}$ | Terbium gallium garnet (TGG), Tb$_3$Ga$_5$O$_{12}$, is well known for its
applications in laser optics, but also exhibits complex low-temperature
magnetism that is not yet fully understood. Its low-temperature magnetic order
is determined by means of time-of-flight neutron powder diffraction. It is
found to be a multia... | 1910.08570v1 |
2019-11-05 | Ground-state properties of the hydrogen chain: insulator-to-metal transition, dimerization, and magnetic phases | Accurate and predictive computations of the quantum-mechanical behavior of
many interacting electrons in realistic atomic environments are critical for
the theoretical design of materials with desired properties, and require
solving the grand-challenge problem of the many-electron Schrodinger equation.
An infinite chai... | 1911.01618v2 |
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