publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2019-11-11 | A simplified and improved approach to tensor network operators in two dimensions | Matrix product states (MPS) and matrix product operators (MPOs) are one
dimensional tensor networks that underlie the modern density matrix
renormalization group (DMRG) algorithm. The use of MPOs accounts for the high
level of generality and wide range of applicability of DMRG. However, current
algorithms for two dimen... | 1911.04592v1 |
2020-01-10 | Quantum algorithms for quantum chemistry and quantum materials science | As we begin to reach the limits of classical computing, quantum computing has
emerged as a technology that has captured the imagination of the scientific
world. While for many years, the ability to execute quantum algorithms was only
a theoretical possibility, recent advances in hardware mean that quantum
computing dev... | 2001.03685v2 |
2020-01-17 | An interlayer with low solubility for lithium enhances tolerance to dendrite growth in solid state electrolytes | All solid state Li-ion batteries employing metallic lithium as an anode offer
higher energy densities while also being safer than conventional liquid
electrolyte based Li-ion batteries. However, the growth of tiny filaments of
lithium (dendrites) across the solid state electrolyte layer leads to premature
shorting of c... | 2001.06276v1 |
2020-03-03 | Ab Initio Full Cell GW+DMFT for Correlated Materials | Quantitative prediction of electronic properties in correlated materials
requires simulations without empirical truncations and parameters. We present a
method to achieve this goal through a new ab initio formulation of dynamical
mean-field theory (DMFT). Instead of using small impurities defined in a
low-energy subspa... | 2003.01349v2 |
2020-03-12 | Genesis of primitive Hawaiian rejuvenated-stage lavas: Evidence for carbonatite metasomatism and implications for ancient eclogite source | To constrain a contribution of deep carbonated mantle, to fractionation of Hf
relative to rare earth elements (REE) in volcanic series, we examine available
high-quality data on major, trace element and Nd-Hf isotope compositions of
primitive lavas and glasses erupted during preshield, postshield and mostly
rejuvenated... | 2003.05705v1 |
2020-07-07 | All-electron Gaussian-based $G_0W_0$ for Valence and Core Excitation Energies of Periodic Systems | We describe an all-electron $G_0W_0$ implementation for periodic systems with
$k$-point sampling implemented in a crystalline Gaussian basis. Our
full-frequency $G_0W_0$ method relies on efficient Gaussian density fitting
integrals and includes both analytic continuation and contour deformation
schemes. Due to the comp... | 2007.03148v3 |
2020-07-16 | Automatic transformation of irreducible representations for efficient contraction of tensors with cyclic group symmetry | Tensor contractions are ubiquitous in computational chemistry and physics,
where tensors generally represent states or operators and contractions express
the algebra of these quantities. In this context, the states and operators
often preserve physical conservation laws, which are manifested as group
symmetries in the ... | 2007.08056v4 |
2020-08-31 | Finite and Infinite Matrix Product States for Gutzwiller Projected Mean-Field Wavefunctions | Matrix product states (MPS) and `dressed' ground states of quadratic mean
fields (e.g. Gutzwiller projected Slater Determinants) are both important
classes of variational wave-functions. This latter class has played important
roles in understanding superconductivity and quantum spin-liquids. We present a
novel method t... | 2009.00064v1 |
2020-12-22 | On the spread of infinite groups | A group is $\frac32$-generated if every non-trivial element is part of a
generating pair. In 2019, Donoven and Harper showed that many Thompson groups
are $\frac32$-generated and posed five questions. The first of these is whether
there exists a 2-generated group with every proper quotient cyclic that is not
$\frac32$-... | 2012.12197v3 |
2021-04-05 | Analyser-free, intensity-based wide-field magneto-optical microscopy | In conventional Kerr- and Faraday microscopy the sample is illuminated with
plane-polarised light and a magnetic domain contrast is generated by an
analyser making use of the Kerr- or Faraday rotation. In this paper we
demonstrate possibilities of analyser-free magneto-optical microscopy based on
magnetisation-dependen... | 2104.01831v2 |
2021-05-20 | Spin dynamics of the quantum dipolar magnet Yb$_3$Ga$_5$O$_{12}$ in an external field | We investigate ytterbium gallium garnet Yb$_{3}$Ga$_{5}$O$_{12}$ in the
paramagnetic phase above the supposed magnetic transition at $T_{\lambda}
\approx 54$ mK. Our study combines susceptibility and specific heat
measurements with neutron scattering experiments and theoretical calculations.
Below 500 mK, the elastic n... | 2105.09817v1 |
2021-12-06 | Space applications of GAGG:Ce scintillators: a study of afterglow emission by proton irradiation | We discuss the results of a proton irradiation campaign of a GAGG:Ce
(Cerium-doped Gadolinium Aluminium Gallium Garnet) scintillation crystal,
carried out in the framework of the HERMES-TP/SP (High Energy Rapid Modular
Ensemble of Satellites -- Technological and Scientific Pathfinder) mission. A
scintillator sample was... | 2112.02897v3 |
2022-01-28 | Using hyper-optimized tensor networks and first-principles electronic structure to simulate experimental properties of the giant {Mn84} torus | The single-molecule magnet {Mn84} is a challenge to theory due to its high
nuclearity. Building on our prior work which characterized the structure of the
spectrum of this magnet, we directly compute two experimentally accessible
observables, the field-dependent magnetization up to 75 T and the
temperature-dependent he... | 2201.11979v1 |
2022-03-10 | Cavity-Dumping a Single Infrared Pulse from a Free-Electron Laser for Two-Color Pump-Probe Experiments | Electromagnetic radiation in the mid- to far-infrared spectral range
represents an indispensable tool for the study of numerous types of collective
excitations in solids and molecules. Short and intense pulses in this THz
spectral range are, however, difficult to obtain. While wide
wavelength-tunability is easily provi... | 2203.05348v1 |
2022-03-20 | Deposition temperature dependence of thermo-spin and magneto-thermoelectric conversion in Co$_2$MnGa films on Y$_3$Fe$_5$O$_{12}$ and Gd$_3$Ga$_5$O$_{12}$ | We have characterized Co$_2$MnGa (CMG) Heusler alloy films grown on
Y$_3$Fe$_5$O$_{12}$ (YIG) and Gd$_3$Ga$_5$O$_{12}$ (GGG) substrates at
different deposition temperatures and investigated thermo-spin and
magneto-thermoelectric conversion properties by means of a lock-in thermography
technique. X-ray diffraction, magn... | 2203.10566v2 |
2022-04-04 | Magnetocaloric properties of $R_3$Ga$_5$O$_{12}$ ($R$ = Tb,Gd,Nd,Dy) | We report the characteristic magnetic properties of several members of the
rare-earth garnet family, Gd$_3$Ga$_5$O$_{12}$ (GGG), Dy$_3$Ga$_5$O$_{12}$
(DGG), Tb$_3$Ga$_5$O$_{12}$ (TGG), and Nd$_3$Ga$_5$O$_{12}$ (NGG), and compare
their relative potential utility for magnetocaloric cooling, including their
minimal adiaba... | 2204.01752v2 |
2022-05-05 | Performance of a spaghetti calorimeter prototype with tungsten absorber and garnet crystal fibres | A spaghetti calorimeter (SPACAL) prototype with scintillating crystal fibres
was assembled and tested with electron beams of energy from 1 to 5 GeV. The
prototype comprised radiation-hard Cerium-doped Gd$_3$Al$_2$Ga$_3$O$_{12}$
(GAGG:Ce) and Y$_3$Al$_5$O$_{12}$ (YAG:Ce) embedded in a pure tungsten
absorber. The energy ... | 2205.02500v3 |
2022-08-03 | Is there evidence for exponential quantum advantage in quantum chemistry? | The idea to use quantum mechanical devices to simulate other quantum systems
is commonly ascribed to Feynman. Since the original suggestion, concrete
proposals have appeared for simulating molecular and materials chemistry
through quantum computation, as a potential ``killer application''. Indications
of potential expo... | 2208.02199v3 |
2022-09-01 | Growth parameters of Bi0.1Y2.9Fe5O12 thin films for high frequency applications | The growth and characterization of Bismuth (Bi) substituted YIG (Bi-YIG,
Bi0.1Y2.9Fe5O12) thin films are reported. Pulsed laser deposited (PLD) films
with thicknesses ranging from 20 to 150 nm were grown on Gadolinium Gallium
Garnet substrates. Two substrate orientations of (100) and (111) were
considered. The enhanced... | 2209.00558v1 |
2022-09-21 | Performance enhancement of a spin-wave-based reservoir computing system utilizing different physical conditions | The authors have numerically studied how to enhance reservoir computing
performance by thoroughly extracting their spin-wave device potential for
higher-dimensional information generation. The reservoir device has a 1-input
exciter and 120-output detectors on the top of a continuous magnetic garnet
film for spin-wave t... | 2209.10123v1 |
2022-10-14 | The Surprisingly Straightforward Scene Text Removal Method With Gated Attention and Region of Interest Generation: A Comprehensive Prominent Model Analysis | Scene text removal (STR), a task of erasing text from natural scene images,
has recently attracted attention as an important component of editing text or
concealing private information such as ID, telephone, and license plate
numbers. While there are a variety of different methods for STR actively being
researched, it ... | 2210.07489v2 |
2022-11-04 | GARNet: Global-Aware Multi-View 3D Reconstruction Network and the Cost-Performance Tradeoff | Deep learning technology has made great progress in multi-view 3D
reconstruction tasks. At present, most mainstream solutions establish the
mapping between views and shape of an object by assembling the networks of 2D
encoder and 3D decoder as the basic structure while they adopt different
approaches to obtain aggregat... | 2211.02299v1 |
2022-12-21 | Towards Neural Variational Monte Carlo That Scales Linearly with System Size | Quantum many-body problems are some of the most challenging problems in
science and are central to demystifying some exotic quantum phenomena, e.g.,
high-temperature superconductors. The combination of neural networks (NN) for
representing quantum states, coupled with the Variational Monte Carlo (VMC)
algorithm, has be... | 2212.11296v1 |
2022-12-22 | Spin wave dispersion of ultra-low damping hematite ($α\text{-Fe}_2\text{O}_3$) at GHz frequencies | Low magnetic damping and high group velocity of spin waves (SWs) or magnons
are two crucial parameters for functional magnonic devices. Magnonics research
on signal processing and wave-based computation at GHz frequencies focussed on
the artificial ferrimagnetic garnet Y$_3$Fe$_5$O$_{12}$ (YIG) so far. We report
on spi... | 2212.11887v2 |
2023-01-18 | Hierarchical Clifford transformations to reduce entanglement in quantum chemistry wavefunctions | The performance of computational methods for many-body physics and chemistry
is strongly dependent on the choice of basis used to cast the problem; hence,
the search for better bases and similarity transformations is important for
progress in the field. So far, tools from theoretical quantum information have
been not t... | 2301.07726v1 |
2023-02-28 | CHGNet: Pretrained universal neural network potential for charge-informed atomistic modeling | The simulation of large-scale systems with complex electron interactions
remains one of the greatest challenges for the atomistic modeling of materials.
Although classical force fields often fail to describe the coupling between
electronic states and ionic rearrangements, the more accurate
\textit{ab-initio} molecular ... | 2302.14231v2 |
2023-07-06 | Spin transport from order to disorder | Schwinger boson mean-field theory (SBMFT) is a non-perturbative approach
which treats ordered and disordered phases of magnetic systems on equal
footing. We leverage its versatility to evaluate the spin correlators which
determine thermally-induced spin transport (the spin Seebeck effect) in
Heisenberg ferromagnets (FM... | 2307.02734v1 |
2023-12-10 | Radiation resistance of fine-grained ceramics Y2.5Nd0.5Al5O12 under Xe-ions irradiation | Oxide Y2.5Nd0.5Al5O12 (YAG:Nd) with garnet structure was synthesized in the
powder and ceramics forms. Fine-grained YAG:Nd ceramics with a relative density
of ~99% were obtained by the Spark Plasma Sintering method (SPS). The radiation
resistance of ceramics was studied under irradiation with swift Xe-ions (E =
146 MeV... | 2312.05820v1 |
2023-12-29 | Fast emulation of fermionic circuits with matrix product states | We describe a matrix product state (MPS) extension for the Fermionic Quantum
Emulator (FQE) software library. We discuss the theory behind symmetry adapted
matrix product states for approximating many-body wavefunctions of spin-1/2
fermions, and we present an open-source, MPS-enabled implementation of the FQE
interface... | 2312.17657v3 |
1997-12-17 | Late Spectral Evolution of SN 1987A: II. Line Emission | Using the temperature and ionization calculated in our previous paper, we
model the spectral evolution of SN 1987A. The IR-catastrophe is seen in the
metal lines as a transition from thermal to non-thermal excitation, most
clearly in the [O I] 6300, 6364 lines. The distribution of the different zones,
and therefore the... | 9712224v1 |
2001-07-09 | Implications of O and Mg abundances in metal-poor halo stars for stellar iron yields | Inhomogeneous chemical evolution models of galaxies which try to reproduce
the scatter seen in element-to-iron ratios of metal-poor halo stars are heavily
dependent on theoretical nucleosynthesis yields of core-collapse supernovae.
Hence inhomogeneous models present themselves as a test for stellar nucleosyn-
thesis ca... | 0107153v2 |
2001-08-07 | Heavy Element Diffusion in Metal Poor Stars | Stellar evolution models which include the effect of helium and heavy element
diffusion have been calculated for initial iron abundances of [Fe/H] = -2.3,
-2.1, -1.9 and -1.7. These models were calculated for a large variety of masses
and three separate mixing lengths, \alpha = 1.50, 1.75 and 2.00 (with \alpha =
1.75 b... | 0108119v1 |
2002-06-18 | Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton | We present the analysis of multi-wavelength XMM-Newton data from the Seyfert
galaxy NGC 3783, including UV imaging, X-ray and UV lightcurves, the 0.2-10 keV
X-ray continuum, the iron K-alpha emission line, and high-resolution
spectroscopy and modelling of the soft X-ray warm absorber. The 0.2-10 keV
spectral continuum ... | 0206316v2 |
2003-01-29 | The iron line in MCG-6-30-15 from XMM-Newton: evidence for gravitational light-bending? | The lack of variability of the broad iron line seen in the Seyfert 1 galaxy
MCG-6-30-15 is studied using the EPIC pn data obtained from a 2001 observation
of 325 ks, during which the count rate from the source varied by a factor of 5.
The spectrum of 80 ks of data from when the source was bright, using the the
lowest 1... | 0301588v1 |
2005-01-10 | Massive elliptical galaxies in X-rays: the role of late gas accretion | We present a new chemical evolution model meant to be a first step in the
self-consistent study of both optical and X-ray properties of elliptical
galaxies. Detailed cooling and heating processes in the interstellar medium are
taken into account using a mono-phase one-zone treatment which allows a more
reliable modelli... | 0501149v1 |
2005-02-17 | Lifting the Iron Curtain : Toward an Understanding of the Iron Stars XX Oph and AS 325 | We present new optical, near infrared, and archival ultraviolet observations
of XX Ophiuchi and AS 325, two proposed iron stars. These unusual stars have
optical spectra dominated by emission lines arising from hydrogen as well as
ionized metals such as iron, chromium, and titanium. Both stars have been
classified as i... | 0502336v1 |
2005-03-24 | High resolution X-ray spectrum of the accreting binary X-ray pulsar GX 1+4 | We present here high resolution X-ray spectrum of the accreting binary X-ray
pulsar GX 1+4 obtained with the High Energy Transmission Grating (HETG)
instrument of the Chandra X-ray Observatory. This was supplemented by a
simultaneous observation with the Proportional Counter Array (PCA) of the Rossi
X-ray Timing Explor... | 0503530v1 |
2005-06-12 | Chandra Observation of the Cluster of Galaxies MS 0839.9+2938 at z=0.194: the Central Excess Iron and SN Ia Enrichment | We present the Chandra study of the intermediately distant cluster of
galaxies MS 0839.9+2938. By performing both the projected and deprojected
spectral analyses, we find that the gas temperature is approximately constant
at about 4 keV in 130-444h_70^-1 kpc. In the inner regions, the gas temperature
descends towards t... | 0506260v1 |
2005-07-13 | XMM-Newton spectral properties of the Ultraluminous IRAS Galaxy Mrk 273 | We present a 23 ks XMM-Newton observation of the ULIRG Mrk 273. The hard
X-ray spectrum can be modeled by a highly absorbed power law plus an Fe Kalpha
emission line. The iron line is broad, suggesting possible superposition of a
neutral iron line at 6.4 keV, and a blend of ionized iron lines from Fe XXV and
Fe XXVI. G... | 0507321v1 |
2005-08-22 | The Spin Periods and Rotational Profiles of Neutron Stars at Birth | We present results from an extensive set of one- and two-dimensional
radiation-hydrodynamic simulations of the supernova core collapse, bounce, and
postbounce phases, and focus on the protoneutron star (PNS) spin periods and
rotational profiles as a function of initial iron core angular velocity, degree
of differential... | 0508462v2 |
2006-10-19 | High-resolution ultraviolet spectroscopy of PG1159-035 with HST and FUSE | PG1159-035 is the prototype of the PG1159 spectral class which consists of
extremely hot hydrogen-deficient (pre-) white dwarfs. It is also the prototype
of the GW Vir variables, which are non-radial g-mode pulsators. The study of
PG1159 stars reveals insight into stellar evolution and nucleosynthesis during
AGB and po... | 0610592v2 |
2007-08-09 | An XMM-Newton survey of broad iron lines in Seyfert galaxies | We present an analysis of the X-ray spectra of a sample of 37 observations of
26 Seyfert galaxies observed by XMM-Newton in order to characterize their iron
K emission. All objects show evidence for iron line emission in the 6-7 keV
band. A narrow core at 6.4 keV is seen almost universally in the spectra, and
we model ... | 0708.1305v1 |
2008-09-30 | Tools for Dissecting Supernova Remnants Observed with Chandra: Methods and Application to the Galactic Remnant W49B | We introduce methods to quantify the X-ray morphologies of supernova remnants
observed with the Chandra X-ray Telescope. These include a power-ratio
technique to measure morphological asymmetries, correlation-length analysis to
probe chemical segregation and distribution, and wavelet-transform analysis to
quantify X-ra... | 0810.0009v2 |
2009-04-21 | A relativistically smeared spectrum in the neutron star X-ray Binary 4U 1705-44: Looking at the inner accretion disc with X-ray spectroscopy | Iron emission lines at 6.4-6.97 keV, identified with fluorescent Kalpha
transitions, are among the strongest discrete features in the X-ray band. These
are therefore one of the most powerful probes to infer the properties of the
plasma in the innermost part of the accretion disc around a compact object. In
this paper w... | 0904.3318v2 |
2009-06-08 | On the Non-relativistic Origin of Red-skewed Iron Lines in CV, Neutron Star and Black Hole Sources | We perform the analysis of the iron K_alpha lines detected in three sources
representing of three types of accreting compact sources: cataclysmic variable
(CV) GK Per, neutron star (NS) Serpens X-1 and black hole (BH) GX 339-4. We
find, using data from Epic-PN Camera on-board XMM-Newton observatory,that the
iron K_alph... | 0906.1490v1 |
2010-01-13 | X-ray spectral study of the hot gas in three Clusters of Galaxies | We study the physical properties of three clusters of galaxies, selected from
a BeppoSAX Wide Field Camera (WFC) survey. These sources are identified as 1RXS
J153934.7-833535, 1RXS J160147.6-754507, and 1RXS J081232.3-571423 in the ROSAT
All-Sky Survey catalogue. We obtained XMM-Newton follow-up observations for
these ... | 1001.2222v2 |
2010-06-10 | Rms variability properties of the iron K alpha line in Seyfert galaxies | We present an analysis of the rms variability spectra of a sample of 18
observations of 14 Seyfert galaxies observed by XMM-Newton, which exhibit
sufficient variability and signal-to-noise ratio to examine the variations in
the iron K-band. The narrow core of the K alpha line at 6.4 keV, seen
universally in Seyferts, s... | 1006.1982v1 |
2010-07-28 | The Suzaku Hard X-ray Survey on the Galactic Center Region | Diffuse X-rays from the Galactic center (GC) region were found to exhibit
many K-shell lines from iron and nickel atoms in the 6--9 keV band. The strong
emission lines seen in the spectrum are neutral iron K$\alpha$ at 6.4~keV,
He-like iron K$\alpha$ at 6.7~keV, H-like iron Ly$\alpha$ at 6.9~keV, and
He-like iron K$\be... | 1007.4863v1 |
2011-01-25 | Broad iron emission lines in Seyfert Galaxies - re-condensation of gas onto an inner disk below the ADAF | Recent observations of Seyfert 1 AGN with Chandra, XMM-Newton and Suzaku
revealed broad iron K_alpha emission lines, some relativistically blurred. For
galactic black hole X-ray binaries XMM-Newton spectra during hard state also
reveal the presence of a relativistic iron emission line and a thermal
component, interpret... | 1101.4854v1 |
2011-03-07 | Modelling the high mass accretion rate spectra of GX 339-4: Black hole spin from reflection? | We extract all the XMM-Newton EPIC pn burst mode spectra of GX 339-4,
together with simultaneous/contemporaneous RXTE data. These include three disc
dominated and two soft intermediate spectra, and the combination of broad
bandpass/moderate spectral resolution gives some of the best data on these
bright soft states in ... | 1103.1256v2 |
2011-06-13 | Size of the group IVA iron meteorite core: Constraints from the age and composition of Muonionalusta | The group IVA fractionally crystallized iron meteorites display a diverse
range of metallographic cooling rates. These have been attributed to their
formation in a metallic core, approximately 150 km in radius, that cooled to
crystallization in the absence of any appreciable insulating mantle. Here we
build upon this f... | 1106.2479v1 |
2014-01-28 | Electronic Evidence of an Insulator-Superconductor Transition in Single-Layer FeSe/SrTiO3 Films | In high temperature cuprate superconductors, it is now generally agreed that
the parent compound is a Mott insulator and superconductivity is realized by
doping the antiferromagnetic Mott insulator. In the iron-based superconductors,
however, the parent compound is mostly antiferromagnetic metal, raising a
debate on wh... | 1401.7115v1 |
2014-04-02 | X-ray diagnostics of chemical composition of the accretion disk and donor star in UCXBs II: XMM-Newton observations | We search for the Fe K${\alpha}$ line in spectra of Ultra Compact X-ray
Binaries (UCXBs). For this purpose we have analyzed XMM-Newton observations of
five confirmed UCXBs. We find that the object 2S 0918-549 - whose optical
spectrum bears tentative signatures of a C/O accretion disk - is devoid of any
emission feature... | 1404.0617v2 |
2014-10-08 | A metal-rich elongated structure in the core of the group NGC4325 | We used X-ray 2D spectrally resolved maps to resolve structure in temperature
and metal abundance. To perform stellar population analysis we applied the
spectral fitting technique with STARLIGHT to the optical spectrum of the
central galaxy. We simulated the chemical evolution of the central galaxy.
While the temperatu... | 1410.2294v2 |
2014-10-24 | Magnetic order without tetragonal-symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum | Most iron-based superconductors undergo a transition to a magnetically
ordered state characterized by staggered stripes of parallel spins. With
ordering vectors $(\pi,0)$ or $(0,\pi)$, this magnetic state breaks the
high-temperature tetragonal symmetry of the system, which is manifested by a
splitting of the lattice Br... | 1410.6789v2 |
2014-11-21 | Relative Mobility of Human Transferrin Domains Accounts for Its Efficient Recognition and Recycling | Human serum transferrin (hTf) transports ferric ions in the blood stream and
inflamed mucosal surfaces with high affinity and delivers them to cells via
receptor mediated endocytosis. A typical hTf is folded into two homologous
lobes; each lobe is further divided into two similar sized domains. Three
different crystal ... | 1411.5954v1 |
2014-12-01 | Magnetised accretion discs in Kerr spacetimes | We study the effect caused by external magnetic fields on the observed
thermal spectra and iron line profiles of thin accretion discs formed around
Kerr black holes and naked singularities. We aim to provide a tool that can be
used to estimate the presence of magnetic fields in the neighbourhood of a
compact object and... | 1412.0557v1 |
2015-05-15 | Orbital selectivity and emergent superconducting state from quasi-degenerate $s-$ and $d-$wave pairing channels in iron-based superconductors | A major puzzle about the nature of the iron-based superconductivity appears
in the case of the alkaline iron selenides. Compared to the iron pnictides,
these systems have only electron Fermi pockets (i.e. no hole Fermi pockets) but
comparable superconducting transition temperatures. The challenge lies in
reconciling th... | 1505.04170v1 |
2015-10-21 | On the neutron-capture elements across the Galactic thin disk using Cepheids | We present new accurate abundances for five neutron-capture (Y, La, Ce, Nd,
Eu) elements in 73 classical Cepheids located across the Galactic thin disk.
Individual abundances are based on high spectral resolution (R ~ 38,000) and
high signal-to-noise ratio (S/N ~ 50-300) spectra collected with UVES at ESO
VLT for the D... | 1510.06314v1 |
2015-10-28 | NIR spectroscopy of the Sun and HD20010 - Compiling a new linelist in the NIR | Context: Effective temperature, surface gravity, and metallicity are basic
spectroscopic stellar parameters necessary to characterize a star or a
planetary system. Reliable atmospheric parameters for FGK stars have been
obtained mostly from methods that relay on high resolution and high
signal-to-noise optical spectros... | 1510.08273v1 |
2016-07-04 | NaFe$_{0.56}$Cu$_{0.44}$As: A pnictide insulating phase induced by on-site Coulomb interaction | In the studies of iron-pnictides, a key question is whether their bad-metal
state from which the superconductivity emerges lies in close proximity with a
magnetically ordered insulating phase. Recently it was found that at low
temperatures, the heavily Cu-doped NaFe$_{1-x}$Cu$_x$As ($x > 0.3$)
iron-pnictide is an insul... | 1607.00770v1 |
2016-07-19 | Detecting supernova neutrinos with iron and lead detectors | Supernova (SN) neutrinos can excite the nuclei of various detector materials
beyond their neutron emission thresholds through charged current (CC) and
neutral current (NC) interactions. The emitted neutrons, if detected, can be a
signal for the supernova event. Here we present the results of our study of SN
neutrino de... | 1607.05591v2 |
2016-09-13 | A new galactic chemical evolution model with dust: results for dwarf irregular galaxies and DLA systems | We present a galactic chemical evolution model which adopts updated
prescriptions for all the main processes governing the dust cycle. We follow in
detail the evolution of the abundances of several chemical species (C, O, S,
Si, Fe and Zn) in the gas and dust of a typical dwarf irregular galaxy. The
dwarf irregular gal... | 1609.03833v1 |
2017-03-08 | Pressure-driven phase transition from antiferromagnetic semiconductor to nonmagnetic metal in two-leg ladders $A$Fe$_2$$X$$_3$ ($A$=Ba or K, $X$=S or Se) | The recent discovery of superconductivity in BaFe$_2$S$_3$ [Takahashi {\it et
al.}, Nat. Mater. {\bf 14}, 1008 (2015)] has stimulated considerable interest
in 123-type iron chalcogenides. This material is the first reported iron-based
two-leg ladder superconductor, as opposed to the prevailing two-dimensional
layered s... | 1703.03071v1 |
2017-03-13 | Star formation, supernovae, iron, and alpha: consistent cosmic and Galactic histories | Recent versions of the observed cosmic star-formation history (SFH) have
resolved an inconsistency with the stellar mass density history. We show that
the revised SFH also scales up the delay-time distribution (DTD) of Type Ia
supernovae (SNe Ia), as determined from the observed volumetric SN Ia rate
history, aligning ... | 1703.04540v5 |
2017-04-18 | Ejection of iron-bearing giant-impact fragments and the dynamical and geochemical influence of the fragment re-accretion | The Earth was born in violence. Many giant collisions of protoplanets are
thought to have occurred during the terrestrial planet formation. Here we
investigated the giant impact stage by using a hybrid code that consistently
deals with the orbital evolution of protoplanets around the Sun and the details
of processes du... | 1704.05251v1 |
2018-01-08 | Search for trans-iron elements in hot, helium-rich white dwarfs with the HST Cosmic Origins Spectrograph | The metal abundances in the atmospheres of hot white dwarfs (WDs) entering
the cooling sequence are determined by the preceding Asymptotic Giant Branch
(AGB) evolutionary phase and, subsequently, by the onset of gravitational
settling and radiative levitation. In this paper, we investigate three hot
He-rich WDs, which ... | 1801.02414v1 |
2018-01-11 | TOPoS: IV. Chemical abundances from high-resolution observations of seven EMP stars | Extremely metal-poor stars provide us with indirect information on the first
generations of massive stars. The TOPoS survey has been designed to increase
the census of these stars and to provide a chemical inventory that is as
detailed as possible. Seven of the most iron-poor stars have been observed with
the UVES spec... | 1801.03935v1 |
2018-05-26 | A new ab initio equation of state of hcp-Fe and its implication on the interior structure and mass-radius relations of rocky super-Earths | More than a third of all exoplanets can be classified as super-Earths based
on radius (1-2 $R_{\bigoplus}$) and mass (< 10 $M_{\bigoplus}$). Here we model
mass-radius relations based on silicate mantle and iron core equations of state
to infer to first order the structure and composition range of rocky
super-Earths ass... | 1805.10530v1 |
2018-09-11 | Chemical analysis of NGC 6528: one of the most metal-rich bulge globular cluster | The Bulge Globular Clusters (GCs) are key tracers of this central ancient
component of our Galaxy. It is essential to understand their formation and
evolution to study that of the bulge, as well as their relationship with the
other Galactic GC systems (halo and disk GCs). Our main goals are to obtain
detailed abundance... | 1809.04164v1 |
2019-02-14 | Quantum magnetic imaging of iron biomineralisation in teeth of the chiton Acanthopleura hirtosa | Iron biomineralisation is critical for life. Nature capitalises on the
physical attributes of iron biominerals for a variety of functional, structural
and sensory applications. Although magnetism is an integral property of iron
biominerals, the role it plays in their nano-assembly remains a fundamental,
unanswered ques... | 1902.09637v2 |
2019-09-18 | Electronic correlations in dense iron: from moderate pressure to Earth's core conditions | We discuss the role of dynamical many-electron effects in the physics of iron
and iron-rich solid alloys under applied pressure on the basis of recent ab
initio studies employing the dynamical mean-field theory (DMFT). Electronic
correlations in iron in the moderate pressure range up to 60 GPa are discussed
in the firs... | 1909.08482v1 |
2021-01-11 | Iron Mobility During Diagenesis at Vera Rubin Ridge, Gale Crater, Mars | The Curiosity rover investigated a topographic structure known as Vera Rubin
ridge, associated with a hematite signature in orbital spectra. There,
Curiosity encountered mudstones interpreted as lacustrine deposits, in
continuity with the 300 m-thick underlying sedimentary rocks of the Murray
formation at the base of M... | 2101.03767v1 |
2021-01-29 | A discovery of a low-energy excess in cosmic-ray iron: an evidence of the past supernova activity in the Local Bubble | Since its launch, the Alpha Magnetic Spectrometer - 02 (AMS-02) has delivered
outstanding quality measurements of the spectra of cosmic-ray (CR) species,
$\bar{p}$, $e^{\pm}$, and nuclei, $_1$H-$_8$O, $_{10}$Ne, $_{12}$Mg, $_{14}$Si,
which resulted in a number of breakthroughs. One of the latest long awaited
surprises ... | 2101.12735v2 |
2021-04-21 | Chandra Observations of Excess Fe K$α$ Line Emission in Galaxies with High Star Formation Rates: X-ray Reflection on Galaxy Scales? | In active galactic nuclei (AGN), fluorescent Fe K$\alpha$ (iron) line
emission is generally interpreted as originating from obscuring material around
a supermassive black hole (SMBH) on the scale of a few parsecs (pc). However,
recent Chandra studies indicate the existence of iron line emission extending
to kpc scales ... | 2104.10702v1 |
2021-08-29 | Emergent vortex Majorana zero mode in iron-based superconductors | The vortex of iron-based superconductors is emerging as a promising platform
for Majorana zero mode, owing to a magic integration among intrinsic vortex
winding, non-trivial band topology, strong electron-electron correlations,
high-Tc superconductivity and the simplification of single material. It
overcomes many diffi... | 2108.12850v1 |
2022-01-21 | A Detailed Investigation of the Onion Structure of Exchanged Coupled Magnetic Fe(3-delta)O4@CoFe2O4@Fe(3-delta)O4 Nanoparticles | Nanoparticles (NPs) which combine several magnetic phases offer wide
perspectives for cutting edge applications because of the high modularity of
their magnetic properties. Besides the addition of the magnetic characteristics
intrinsic to each phase, the interface that results from core-shell and,
further, from onion s... | 2201.08923v1 |
2022-01-23 | Improving Time and Position Resolution of RPC detectors using Time Over Threshold Information | INO-ICAL is a proposed underground particle physics experiment to study the
neutrino oscillation parameters by detecting neutrinos produced in the
atmospheric air showers. Iron CALorimeter (ICAL) is to have 151 layers of iron
stacked vertically, with active detector elements in between the iron layers.
The iron layers ... | 2201.09279v2 |
2022-04-21 | Reduced atmospheres of post-impact worlds: The early Earth | Impacts may have had a significant effect on the atmospheric chemistry of the
early Earth. Reduced phases in the impactor (e.g., metallic iron) can reduce
the planet's H$_2$O inventory to produce massive atmospheres rich in H$_2$.
Whilst previous studies have focused on the interactions between the impactor
and atmosph... | 2204.09946v1 |
2022-04-24 | Nematic fluctuations in the non-superconducting iron pnictide BaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$ | The main driven force of the electronic nematic phase in iron-based
superconductors is still under debate. Here, we report a comprehensive study on
the nematic fluctuations in a non-superconducting iron pnictide system
BaFe$_{1.9-x}$Ni$_{0.1}$Cr$_{x}$As$_{2}$ by electronic transport,
angle-resolved photoemission spectr... | 2204.11204v1 |
2022-05-31 | Galactic chemical evolution of exoplanet host stars: Are high-mass planetary systems young? | The imprints of stellar nucleosynthesis and chemical evolution of the galaxy
can be seen in different stellar populations, with older generation stars
showing higher $\alpha$-element abundances while the later generations becoming
enriched with iron-peak elements. The evolutionary connections and chemical
characteristi... | 2205.15793v2 |
2022-07-20 | Anatomy of rocky planets formed by rapid pebble accretion I. How icy pebbles determine the core fraction and FeO contents | We present a series of papers dedicated to modelling the accretion and
differentiation of rocky planets that form by pebble accretion within the
lifetime of the protoplanetary disc. In this first paper, we focus on how the
accreted ice determines the distribution of iron between the mantle (oxidized
FeO and FeO$_{1.5}$... | 2207.09795v2 |
2023-02-13 | The ignition of fine iron particles in the Knudsen transition regime | A theoretical model is considered to predict the minimum ambient gas
temperature at which fine iron particles can undergo thermal runaway--the
ignition temperature. The model accounts for Knudsen transition transport
effects, which become significant when the particle size is comparable to, or
smaller than, the molecul... | 2302.06704v1 |
2023-03-01 | Techno-economic assessment of long-distance supply chains of energy carriers: Comparing hydrogen and iron for carbon-free electricity generation | Effective usage of renewable energy requires ways of storage and delivery to
balance energy demand and availability divergences. Carbon-free chemical energy
carriers are proposed solutions, converting clean electricity into stable media
for storage and long-distance energy trade. Hydrogen (H$_2$) is the subject of
sign... | 2303.00681v2 |
2023-09-02 | Simulation of RPC responses in mini-Iron Calorimeter for cosmic ray muon studies | A Prototype of the Iron Calorimeter for the India-based Neutrino Observatory
is currently running in Madurai, India. This consists of twenty large area
single gap Resistive Plate Chambers (RPCs) of size, $\sim$ 185\,cm $\times$
175\,cm sandwiched between 11 layers of iron plates of thickness 5.6\,cm. The
total size of ... | 2309.00992v2 |
2013-05-13 | On the metallicity distribution of classical Cepheids in the Galactic inner disk | We present homogeneous and accurate iron abundances for almost four dozen
(47) of Galactic Cepheids using high-spectral resolution (R$\sim$40,000) high
signal-to-noise ratio (S/N $\ge$ 100) optical spectra collected with UVES at
VLT. A significant fraction of the sample (32) is located in the inner disk (RG
$le$ 6.9 kp... | 1305.2742v2 |
1993-09-29 | A Simulation of the Intracluster Medium with Feedback from Cluster Galaxies | The formation and evolution of an X--ray cluster is studied using a 3--D
N-body + hydrodynamical simulation which includes feedback of energy and iron
from cluster galaxies. The differences in evolution and final state between the
simulation and a similar run without feedback are highlighted. We address the
energetics ... | 9309050v1 |
1994-04-20 | A New Multiplet Table for Fe | We have recorded spectra of iron-neon and iron-argon hollow cathode lamps in
the region 1700A -- 5um (59000 -- 2000cm-1), with Fourier transform (FT)
spectrometers at the National Solar Observatory, Tucson, Arizona, U.S.A. and
Imperial College, London, U.K., and with a high resolution grating spectrograph
at the Nation... | 9404049v1 |
1995-11-19 | Silicon Burning I: Neutronization and the Physics of Quasi-Equilibrium | As the ultimate stage of stellar nucleosynthesis, and the source of the iron
peak nuclei, silicon burning is important to our understanding of the evolution
of massive stars and supernovae. Our reexamination of silicon burning, using
results gleaned from simulation work done with a large nuclear network (299
nuclei and... | 9511088v1 |
1996-04-13 | Model neutron star atmospheres with low magnetic fields. 1. Atmospheres in radiative equilibrium | We present a detailed investigation of neutron star atmospheres with low
magnetic fields, $B < 10^8 -10^{10}$ G, which do not affect opacities and
equation of state of the atmospheric matter. We compute the atmospheric
structure, emergent spectral fluxes and specific intensities for hydrogen,
helium and iron atmosphere... | 9604072v1 |
1996-10-23 | Spectral Variability and iron line emission in the ASCA Observations of the Seyfert 1 Galaxy NGC4051 | We present the results of an extensive analysis of the ``ASCA'' AO2
observation of the Seyfert 1 galaxy NGC4051. The target exhibits broadband
[0.5--10 keV] variability by a factor $\sim 8$ on time scales $\sim 10^4 s$,
with a typical doubling time $\sim 500 s$. The spectrum is characterized by a
strong emission excess... | 9610180v1 |
1997-05-12 | ASCA observations of type-2 Seyfert galaxies: II. The Importance of X-ray Scattering and Reflection | We discuss the importance of X-ray scattering and Compton reflection in
type-2 Seyfert galaxies, based upon the analysis of ASCA observations of 25
such sources. Consideration of the iron Kalpha, [O III] line and X-ray
variability suggest that NGC 1068, NGC 4945, NGC 2992, Mrk 3, Mrk 463E and Mrk
273 are dominated by r... | 9705087v1 |
1997-05-29 | Is UU Herculis a post-AGB star? | In order to understand the evolutionary status of the anomalous supergiant
UUHer, the prototype of the class of variable supergiants located at high
galactic latitudes, we obtained several high-resolution spectra of this star,
with the 6m telescope, over 5 years. This material was used for a search of
possible temporal... | 9705230v1 |
1997-06-15 | Supernovae Types Ia/II and Intracluster Medium Enrichment | We re-examine the respective roles played by supernovae (SNe) Types Ia and II
in enriching the intracluster medium (ICM) of galaxy clusters, in light of the
recent downward shift of the ASCA abundance ratios of alpha-elements to iron
favoured by Ishimaru & Arimoto (1997, PASJ, 49, 1). Because of this shift,
Ishimaru & ... | 9706138v1 |
1997-07-07 | Rosat, Asca and Osse Observations of the Broad Line Radio Galaxy 3C120 | We present simultaneous observations of the superluminal radio galaxy 3C120
performed with the ASCA and GRO (OSSE) satellites on February-March 1994, as
well as an analysis of all the ROSAT archival data. The ASCA spectrum of this
object can be described by an absorbed (N_H=1.6e^21 cm^-2) power law with
photon index Ga... | 9707078v1 |
1997-07-10 | Infrared and Optical Spectroscopy of Type Ia Supernovae in the Nebular Phase | We present near-infrared (NIR) spectra for Type Ia supernovae at epochs of 13
to 338 days after maximum blue light. Some contemporary optical spectra are
also shown. All the NIR spectra exhibit considerable structure throughout the
J-, H- and K-bands. In particular they exhibit a flux `deficit' in the J-band
which pers... | 9707119v1 |
1997-08-20 | Further constraints on white dwarf galactic halos | The suggestion that roughly half the mass of the galactic halo might be in
the form of white dwarfs, together with the limits on the infrared background
light and on the initial metallicity of the galactic disk, would set strong
constraints on the initial mass function (IMF) of the halo. Particular IMFs
have been propo... | 9708178v1 |
1997-11-14 | Simultaneous ASCA And RXTE Observations of Cygnus X--1 During Its 1996 State Transition | We report results from simultaneous ASCA and RXTE observations of Cyg X-1
when the source made a rare transition from the hard (= low) state to the soft
(= high) state in 1996. These observations together cover a broad energy range
~0.7--50 keV with a moderate energy resolution at the iron K-band, thus make it
possible... | 9711164v1 |
1997-12-17 | Complex Absorption and Reflection of a Multi-temperature Cyclotron-Bremsstrahlung X-ray Cooling Shock in BY Cam | We re-analyse the ASCA and GINGA X-ray data from BY Cam, a slightly
asynchronous magnetic accreting white dwarf. The spectra are strongly affected
by complex absorption, which we model as a continuous (power law) distribution
of covering fraction and column of neutral material. This absorption causes a
smooth hardening... | 9712226v1 |
1998-06-24 | X-ray iron line reverberation from black hole accretion disks | The relativistically broad X-ray iron line seen in many AGN spectra is
thought to originate from the central regions of the putative black hole
accretion disk. Both the line profile and strength will vary in response to
rapid variability of the primary X-ray continuum source. The temporal response
of the line contains ... | 9806327v2 |
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