publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
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2016-07-26 | Experimental Observation of Topological Superconductivity and Majorana Zero Modes on beta-Bi2Pd Thin Films | Using a cryogenic scanning tunneling microscopy, we report the observation of
topologically nontrivial superconductivity on a single material of \beta-Bi2Pd
films grown by molecular beam epitaxy. The superconducting gap associated with
spinless odd-parity pairing opens on the surface and appears much larger than
the bu... | 1607.07551v4 |
2016-07-28 | Imaging current-induced switching of antiferromagnetic domains in CuMnAs | The magnetic order in antiferromagnetic (AF) materials is hard to control
with external magnetic fields. However, recent advances in detecting and
manipulating AF order electrically have opened up new prospects for these
materials in basic and applied spintronics research. Using x-ray magnetic
linear dichroism microsco... | 1607.08478v2 |
2016-08-11 | Evolution of Insulator-Metal Phase Transitions in Epitaxial Tungsten Oxide Films during Electrolyte-Gating | An interface between an oxide and an electrolyte gives rise to various
processes as exemplified by electrostatic charge accumulation/depletion and
electrochemical reactions such as intercalation/decalation under electric
field. Here we directly compare typical device operations of those in electric
double layer transis... | 1608.03357v1 |
2016-10-15 | Dynamical Conductivity of Dirac Materials | For graphene (a Dirac material) it has been theoretically predicted and
experimentally observed that DC resistivity is proportional to $ T^4$ when the
temperature is much less than Bloch- Gr\"{u}neisen ($\Theta_{BG}$) temperature
and T linear in opposite case ($T>>\Theta_{BG}$). Going beyond the DC case, we
investigate... | 1610.04697v1 |
2016-10-18 | Magnetic properties of low-moment ferrimagnetic Heusler Cr2CoGa thin films grown by molecular beam epitaxy | Recently, theorists have predicted many materials with a low magnetic moment
and large spin-polarization for spintronic applications. These compounds are
predicted to form in the inverse Heusler structure, however, many of these
compounds have been found to phase segregate. In this study, ordered Cr2CoGa
thin films wer... | 1610.05808v1 |
2016-10-21 | On the impact of strain on the electronic properties of InAs/GaSb quantum well systems | Electron-hole hybridization in InAs/GaSb double quantum well structures leads
to the formation of a mini band gap. We experimentally and theoretically
studied the impact of strain on the transport properties of this material
system. Thinned samples were mounted to piezo electric elements to exert strain
along the [011]... | 1610.06776v1 |
2016-11-09 | Parallel and series conduction model in Topological Insulators | In the past few years there has been a surge in the material science
engineering in order to synthesize bulk insulating and surface metallic
Topological Insulating (TI) materials. This quest is not only theoretically
important but also promising from the novel application perspective. The
dependence of temperature on r... | 1611.02856v1 |
2016-12-11 | Superconductivity in Se-doped new materials EuSr2Bi2S4F4 and Eu2SrBi2S4F4 | From our powder x ray diffraction pattern, electrical transport and magnetic
studies we report the effect of isovalent Se substitution at S sites in the
newly discovered systems EuSr2Bi2S4F4 and Eu2SrBi2S4F4. We have synthesized two
new variants of 3244 type superconductor with Eu replaced by Sr which is
reported elsew... | 1612.03415v1 |
2017-02-16 | Millimeter-scale layered MoSe2 grown on sapphire and evidence for negative magnetoresistance | Molecular beam epitaxy technique has been used to deposit a single layer and
a bilayer of MoSe 2 on sapphire. Extensive characterizations including in-situ
and ex-situ measurements show that the layered MoSe 2 grows in a scalable
manner on the substrate and reveals characteristics of a stoichiometric
2H-phase. The laye... | 1702.05121v1 |
2017-06-16 | Gate-tunable large magnetoresistance in an all-semiconductor spin-transistor-like device | A large spin-dependent and electric field-tunable magnetoresistance of a
two-dimensional electron system (2DES) is a key ingredient for the realization
of many novel concepts for spin-based electronic devices. The low
magnetoresistance observed during the last decades in devices with lateral
semiconducting (SC) transpo... | 1706.05239v1 |
2017-06-19 | Electrical signature of individual magnetic skyrmions in multilayered systems | Magnetic skyrmions are topologically protected whirling spin textures that
can be stabilized in magnetic materials in which a chiral interaction is
present. Their limited size together with their robustness against the external
perturbations promote them as the ultimate magnetic storage bit in a novel
generation of mem... | 1706.05809v1 |
2017-06-26 | The Sobering Reality of Perovskite/Si Tandem Solar Cells under Realistic Operating Conditions | Perovskite/Si tandem solar cells have the potential to considerably
out-perform conventional solar cells. Under standard test conditions,
perovskite/Si tandem solar cells already outperform the Si single junction.
Under realistic conditions, however, as we show, those tandem solar cells are
hardly more efficient than t... | 1706.08610v1 |
2017-09-11 | Signature of growth-deposition technique on the properties of PECVD and thermal SiO2 | In this article, we report the process induced variation in the
characteristics of PECVD deposited and thermally grown silicon dioxide (SiO2)
thin film. We find key differences in the porosity, arrangement of the
nano-pores, surface roughness, refractive index and electrical resistivity of
the SiO2 thin films obtained ... | 1709.03257v1 |
2017-10-10 | Evidence of a topological Hall effect in Eu$_{1-x}$Sm$_x$TiO$_3$ | We report on the observation of a possible topological Hall effect in thin
films of the itinerant ferromagnet Eu1-xSmxTiO3. EuTiO3 and Eu0.955Sm0.045TiO3
films were grown by molecular beam epitaxy. The EuTiO3 film is insulating. The
Hall resistivity of the Eu0.955Sm0.045TiO3 films exhibits the anomalous Hall
effect bel... | 1710.03729v1 |
2017-10-12 | Thermal conductivity reduction in rough silicon nanomembranes | Nanostructured silicon is a promising material for thermoelectric conversion,
because the thermal conductivity in silicon nanostructures can be strongly
reduced with respect to that of bulk materials. We present thermal conductivity
measurements, performed with the 3$\omega$ technique, of suspended
monocrystalline sili... | 1710.04403v1 |
2017-10-17 | XPS study of the chemical stability of DyBa2Cu3O6+δ superconductor | The chemical stability of the powder DyBa2Cu3O6+{\delta} has been studied by
X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and thermal
analysis at ambient conditions. The powder was subjected to mechanical
processing in a ball mill-activator to accelerate chemical degradation. The
kinetic regularities... | 1710.06271v1 |
2017-10-27 | Percolative nature of the dc paraconductivity in the cuprate superconductors | We present an investigation of the planar direct-current (dc)
paraconductivity of the model cuprate material HgBa$_2$CuO$_{4+\delta}$ in the
underdoped part of the phase diagram. The simple quadratic
temperature-dependence of the Fermi-liquid normal-state resistivity enables us
to extract the paraconductivity above the... | 1710.10220v1 |
2017-10-31 | Suppression of vacancies boosts thermoelectric performance in type-I clathrates | Intermetallic type-I clathrates continue to attract attention as promising
thermoelectric materials. Here we present structural and thermoelectric
properties of single crystalline Ba8(Cu,Ga,Ge,v)46, where v denotes a vacancy.
By single crystal X-ray diffraction on crystals without Ga we find clear
evidence for the pres... | 1710.11536v1 |
2018-01-02 | Edge-Grafted Molecular Junctions between Graphene Nanoplatelets: Applied Chemistry to Enhance Heat Transfer in Nanomaterials | The edge-functionalization of graphene nanoplatelets (GnP) was carried out
exploiting diazonium chemistry, aiming at the synthesis of edge decorated
nanoparticles to be used as building blocks in the preparation of engineered
nanostructured materials for enhanced heat transfer. Indeed, both phenol
functionalized and di... | 1801.00859v1 |
2018-01-03 | Ion-exchange synthesis and superconductivity at 8.6 K of Na2Cr3As3 with quasi-one-dimensional crystal structure | A new Cr-based quasi-one-dimensional superconductor Na2Cr3As3 was synthesized
by an ion-exchange method in sodium naphthalenide solution. The crystals are
thread-like and the structure was analyzed by X-ray diffraction with a
noncentrosymmetric hexagonal space group P-6m2 (No. 187), in which the
(Cr3As3)2- linear chain... | 1801.01010v1 |
2018-01-04 | Crystal growth and magnetic anisotropy in the spin-chain ruthenate Na$_2$RuO$_4$ | We report single crystal growth, electrical resistivity $\rho$, anisotropic
magnetic susceptibiltiy $\chi$, and heat capacity $C_p$ measurements on the
one-dimensional spin-chain ruthenate Na$_2$RuO$_4$. We observe variable range
hopping (VRH) behaviour in $\rho(T)$. The magnetic susceptibility with magnetic
field perp... | 1801.01524v1 |
2018-01-17 | The simultaneous discharge of liquid and grains from a silo | The flow rate of water through an orifice at the bottom of a container
depends on the hydrostatic pressure whereas for a dry granular material is
nearly constant. But what happens during the simultaneous discharge of grains
and liquid from a silo? By measuring the flow rate as a function of time, we
found that: (i) dif... | 1801.05747v1 |
2018-02-16 | Levitated electromechanics: all-electrical cooling of charged nano- and micro-particles | We show how charged levitated nano- and micro-particles can be cooled by
interfacing them with an $RLC$ circuit. All-electrical levitation and cooling
is applicable to a wide range of particle sizes and materials, and will enable
state-of-the-art force sensing within an electrically networked system.
Exploring the cool... | 1802.05928v3 |
2018-02-21 | Design of Chern Insulating Phases in Honeycomb Lattices | The search for robust examples of the magnetic version of topological
insulators, referred to as quantum anomalous Hall insulators or simply Chern
insulators, so far lacks success. Our groups have explored two distinct
possibilities based on multiorbital 3d oxide honeycomb lattices. Each has a
Chern insulating phase ne... | 1802.07411v1 |
2018-02-21 | Meta-screening and permanence of polar distortion in metallized ferroelectrics | Ferroelectric materials are characterized by a spontaneous polar distortion.
The behavior of such distortions in the presence of free charge is the key to
the physics of metallized ferroelectrics in particular, and of
structurally-polar metals more generally. Using first-principles simulations,
here we show that a pola... | 1802.07464v1 |
2018-04-09 | Canted antiferromagnetism in phase-pure CuMnSb | We report the low-temperature properties of phase-pure single crystals of the
half-Heusler compound CuMnSb grown by means of optical float-zoning. The
magnetization, specific heat, electrical resistivity, and Hall effect of our
single crystals exhibit an antiferromagnetic transition at $T_{\mathrm{N}} =
55~\mathrm{K}$ ... | 1804.03223v1 |
2018-04-24 | Electrical and thermal transport in coplanar polycrystalline graphene-hBN heterostructures | We present a theoretical study of electronic and thermal transport in
polycrystalline heterostructures combining graphene (G) and hexagonal boron
nitride (hBN) grains of varying size and distribution. By increasing the hBN
grain density from a few percents to $100\%$, the system evolves from a good
conductor to an insu... | 1804.09272v2 |
2018-05-08 | Relativistic Gurzhi effect in channels of Dirac materials | Charge transport in channel-shaped 2D Dirac systems is studied employing the
Boltzmann equation. The dependence of the resistivity on temperature and
chemical potential is investigated. An accurate understanding of the influence
of electron-electron interaction and material disorder allows us to identify a
parameter re... | 1805.02987v2 |
2018-05-28 | Phonon Fingerprints of CsPb2Br5 Single Crystals | CsPb2Br5 is a stable, water-resistant, material derived from CsPbBr3
perovskite and featuring two-dimensional Pb-Br framework separated by Cs
layers. Both compounds can coexist at nano- length scale, which often produces
conflicting optical spectroscopy results. We present a complete set of
polarized Raman spectra of n... | 1805.11181v1 |
2018-06-01 | Flat bands and the physics of strongly correlated Fermi systems | Some materials can have the dispersionless parts in their electronic spectra.
These parts are usually called flat bands and generate the corps of unusual
physical properties of such materials. These flat bands are induced by the
condensation of fermionic quasiparticles, being very similar to the Bose
condensation. The ... | 1806.00438v1 |
2018-06-19 | Influence of Interfaces on the Transport Properties of Graphite revealed by Nanometer Thickness Reduction | We investigated the influence of thickness reduction on the transport
properties of graphite microflakes. Using oxygen plasma etching we decreased
the thickness of highly oriented pyrolytic graphite (HOPG) microflakes from
$\sim 100$~nm to $\sim 20$~nm systematically. Keeping current and voltage
electrodes intact, the ... | 1806.07417v3 |
2018-06-20 | Concurrent transitions in wear rate and surface microstructure in nanocrystalline Ni-W | Nanocrystalline metals are promising materials for wear-resistant
applications due to their superior strength and hardness, but prior work has
shown that cyclic loading can lead to coarsening. In this study, scratch wear
tests were carried out on nanocrystalline Ni-19 at.% W films with an
as-deposited grain size of 3 n... | 1806.07919v2 |
2018-06-27 | Spin splitting induced in a superconductor by an antiferromagnetic insulator | Inspired by recent feats in exchange coupling antiferromagnets to an adjacent
material, we demonstrate the possibility of employing them for inducing spin
splitting in a superconductor, thereby avoiding the detrimental, parasitic
effects of ferromagnets employed to this end. We derive the Gor'kov equation
for the matri... | 1806.10356v2 |
2019-08-30 | Efficient Pourbaix diagrams of many-element compounds | Pourbaix diagrams have long been an essential tool for determining the phase
stability of solids and their associated ionic species under electrochemical
conditions. In recent years, Pourbaix diagrams have been used for applications
ranging from corrosion-resistance alloy design to electrocatalysis, and the
data from w... | 1909.00035v1 |
2019-09-02 | Nematic properties of FeSe$_{1-x}$Te$_{x}$ crystals with a low Te content | We report on the synthesis and physical properties of FeSe$_{1-x}$Te$_x$
single crystals with a low Te content (x = 0.17, 0.21, 0.25), where the
replacement of Se with Te partially suppresses superconductivity. Resistivity
and Hall effect measurements indicate weak anomalies at elevated temperatures
ascribed to nematic... | 1909.00711v1 |
2019-09-10 | Ferroelectric enhancement of superconductivity in compressively strained SrTiO$_3$ films | SrTiO$_3$ is an incipient ferroelectric on the verge of a polar instability,
which is avoided at low temperatures by quantum fluctuations. Within this
unusual quantum paraelectric phase, superconductivity persists despite
extremely dilute carrier densities. Ferroelectric fluctuations have been
suspected to play a role ... | 1909.04782v1 |
2014-08-07 | Magneto-transport properties of oriented Mn2CoAl films sputtered on thermally oxidized Si substrates | Spin gapless semiconductors are interesting novel class of materials by
embracing both magnetism and semiconducting. Its potential application in
future spintronics requires realization in thin film form. In this letter, we
report a successful growth of spin gapless Mn2CoAl films on thermally oxidized
Si substrates by ... | 1408.1547v1 |
2017-03-06 | Pressure-Induced Insulator-to-Metal Transition Provides Evidence for Negative-$U$ Centers in Large-Gap Disordered Insulators | Attractive negative-$U$ interactions between electrons facilitated by strong
electron-phonon interaction are common in highly polarizable and disordered
materials such as amorphous chalcogenides, but there is no direct evidence for
them in large-band-gap insulators. Here we report how such negative-$U$ centers
are resp... | 1703.02003v1 |
2017-03-20 | Optimized spin-injection efficiency and spin MOSFET operation based on low-barrier ferromagnet/insulator/n-Si tunnel contact | We theoretically investigate the spin injection in different FM/I/n-Si tunnel
contacts by using the lattice NEGF method. We find that the tunnel contacts
with low barrier materials such as TiO$_2$ and Ta$_{2}$O$_{5}$, have much lower
resistances than the conventional barrier materials, resulting in a wider and
attainab... | 1703.06835v3 |
2013-12-24 | All-Metallic Electrically-Gated Tantalum Diselenide Switches and Logic Circuits | We report the fabrication and performance of all-metallic three-terminal
devices with tantalum diselenide thin-film conducting channels. For this
proof-of-concept demonstration, the layers of 2H-TaSe2 were exfoliated
mechanically from single crystals grown by the chemical vapor transport method.
Devices with nanometer-... | 1312.6863v1 |
2014-10-27 | Giant supercurrent states in a superconductor-InAs/GaSb-superconductor junction | Superconductivity in topological materials has attracted a great deal of
interest in both electron physics and material sciences since the theoretical
predictions that Majorana fermions can be realized in topological
superconductors [1-4]. Topological superconductivity could be realized in a
type II, band-inverted, InA... | 1410.7342v3 |
2014-10-30 | Kondo effect and non-Fermi liquid behavior in Dirac and Weyl semimetals | We study the Kondo effect in three-dimensional (3D) Dirac materials and Weyl
semimetals. We find the scaling of the Kondo temperature with respect to the
doping $n$ and the coupling $J$ between the moment of the magnetic impurity and
the carriers of the semimetal. We find that when the temperature is much
smaller than ... | 1410.8532v2 |
2014-11-07 | Temperature evolution of magnetic and transport behavior in 5\textit{d} Mott insulator Sr$_2$IrO$_4$: Significance of magneto-structural coupling | We have investigated the temperature evolution of magnetism and its
interrelation with structural parameters in perovskite-based layered compound
Sr$_2$IrO$_4$, which is believed to be a $J_{eff}$ = 1/2 Mott insulator. The
structural distortion plays an important role in this material which induces a
weak ferromagnetis... | 1411.1946v1 |
2014-11-19 | Electronic structure and transport properties of Cu-deficient kuramite Cu3-xSnS4 | Electrical and thermal transport properties of Cu-deficient kuramite
Cu3-xSnS4 (CTS) was examined as a possible earth-abundant thermoelectric
material. Crystallographic structure of CTS was characterized by partial
disorder between Cu and Sn. In contrast to semiconducting electrical transport
of related compounds, such... | 1411.5122v2 |
2015-05-20 | III-V/Si Wafer Bonding Using Transparent, Conductive Oxide Interlayers | We present a method for low temperature plasma-activated direct wafer bonding
of III-V materials to Si using a transparent, conductive indium zinc oxide
interlayer. The transparent, conductive oxide (TCO) layer provides excellent
optical transmission as well as electrical conduction, suggesting suitability
for Si/III-V... | 1505.05453v2 |
2016-06-10 | Pressure sensing using vertically aligned carbon nanotubes on a flexible substrate | Sensing technologies have been under research and development for their
varied applications from microelectronics to space exploration. With the end of
Moores law in sight, there is growing demand for shrinking materials and
improving sensitivity and range of sensing of sensors. Carbon nanotubes (CNTs)
offer an excelle... | 1606.03190v1 |
2016-06-18 | Failure mechanisms of single-crystal silicon electrodes in lithium-ion batteries | Long-term durability is a major obstacle limiting the widespread use of
lithium ion batteries (LIBs) in heavy-duty applications and others demanding
extended lifetime. As one of the root causes of degradation and failure of
battery performance, the electrode failure mechanisms are still unknown. Here,
we reveal the fun... | 1606.06283v1 |
2016-06-26 | (CaO)(FeSe): A Layered Wide Gap Oxychalcogenide Semiconductor | A new iron-oxychalcogenide (CaO)(FeSe) was obtained which crystallizes in the
orthorhombic space group Pnma (No. 62) with a = 5.9180(12) {\AA}, b = 3.8802(8)
{\AA}, c = 13.193(3) {\AA}. The unique structure of (CaO)(FeSe) is built up of
a quasi-two-dimensional network of corrugated infinite layers of corner-shared
FeSe... | 1606.08000v1 |
2017-01-17 | Strange metal state near a heavy-fermion quantum critical point | Recent experiments on quantum criticality in the Ge-substituted
heavy-electron material YbRh2Si2 under magnetic field have revealed a possible
non-Fermi liquid (NFL) strange metal (SM) state over a finite range of fields
at low temperatures, which still remains a puzzle. In the SM region, the
zero-field antiferromagnet... | 1701.04599v1 |
2017-01-17 | Lifshitz transition mediated electronic transport anomaly in bulk ZrTe5 | Zirconium pentatelluride ZrTe$_5$, a fascinating topological material
platform, hosts exotic chiral fermions in its highly anisotropic
three-dimensional Dirac band and holds great promise advancing the
next-generation information technology. However, the origin underlying its
anomalous resistivity peak has been under d... | 1701.04737v2 |
2017-01-26 | Spin mediated magneto-electro-thermal transport behavior in Ni80Fe20/MgO/p-Si thin films | In Si, spin-phonon interaction is the primary spin relaxation mechanism. At
low temperatures, the absence of spin-phonon relaxation will lead to enhanced
spin accumulation. Spin accumulation may change the electro-thermal transport
within the material, and thus may serve as an investigative tool for
characterizing spin... | 1701.07854v2 |
2017-11-27 | Extreme magnetoresistance induced by Zeeman effect-driven electron-hole compensation and topological protection in MoSi$_2$ | The magnetoresistance is the magnetic field induced change of electrical
resistivity of a material. Recent studies have revealed extremely large
magnetoresistance in several non-magnetic semimetals, which has been explained
on the basis of either electron-hole compensation or the Fermi surface
topology, or the combinat... | 1711.09646v1 |
2017-11-30 | Experimental observation of node-line-like surface states in LaBi | In a Dirac nodal line semimetal, the bulk conduction and valence bands touch
at extended lines in the Brillouin zone. To date, most of the theoretically
predicted and experimentally discovered nodal lines derive from the bulk bands
of two- and three-dimensional materials. Here, based on combined angle-resolved
photoemi... | 1711.11174v2 |
2017-12-19 | Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La2O2Bi3AgS6 | We have synthesized a new layered oxychalcogenide La2O2Bi3AgS6. From
synchrotron X-ray diffraction and Rietveld refinement, the crystal structure of
La2O2Bi3AgS6 was refined using a model of the P4/nmm space group with a =
4.0644(1) {\AA} and c = 19.412(1) {\AA}, which is similar to the related
compound LaOBiPbS3, whil... | 1712.06726v1 |
2017-12-05 | A Holistic Approach to Evaluate EMI Shielding Characteristics of Carbon Nanotube-based Polymer Composites | The work presents a comprehensive methodology to determine the Shielding
Effectiveness (SE) of single-walled carbon nanotubes (SWCNTs)/polymer
nanocomposites. Here, an algorithm based on Ant Colony Optimization (ACO) was
employed to determine the electrical conductivity ({\sigma}) of these
nanocomposites as a function ... | 1712.08188v1 |
2018-10-13 | Tuning the electronic structures and transport properties of zigzag blue phosphorene nanoribbons | In recent years, single element two-dimensional atom crystal materials have
aroused extensive interest in many applications. Blue phosphorus, successfully
synthesized on Au substrate by molecular beam epitaxy not long ago, shows
unusual geometrical and electronic structures. We investigate the electronic
structures and... | 1810.05792v1 |
2018-10-18 | Coating of Aluminum Alloys by Micro Arc Oxidation in Nitrate Salt | Plasma electrolytic oxidation (PEO) is a process for obtaining oxide coatings
on valve metals. Mostly PEO is done in an aqueous solution electrolyte which
limits the size of treated parts due to the system heating up. In presented
work an alternative method of PEO processing applied in aluminum 1050 alloy in
nitrate mo... | 1810.08018v1 |
2018-11-26 | Synthesis of Oxidation-Resistant Electrochemical-Active Copper Nanowires Using Phenylenediamine Isomers | Phenylenediamine (PDA) was chosen as a coordinating, reducing, and capping
agent to effectively direct growth and protect against oxidation of Cu
nanowires (Cu NWs) in an aqueous solution. PDA was found to reduce Cu (II) to
Cu (I) at room temperature, and stabilize the resulting Cu (I) by forming a
coordination complex... | 1811.10510v1 |
2019-01-31 | Unconventional Bloch-Grüneisen scattering in hybrid Bose-Fermi systems | We report on the novel mechanism of electron scattering in hybrid Bose-Fermi
systems consisting of a two-dimensional electron gas in the vicinity of an
exciton condensate: We show that a pair-of-bogolons--mediated scattering proves
to be dominating over the conventional acoustic phonon channel and over the
single-bogol... | 1902.01214v1 |
2019-02-14 | Charge transport in oxygen-deficient EuTiO$_3$: the emerging picture of dilute metallicity in quantum-paraelectric perovskite oxides | We report on a study of charge transport in EuTiO$_{3-\delta}$ single
crystals with carrier density tuned across several orders of magnitude.
Comparing this system with other quasi-cubic perovskites, in particular
strontium titanate, we draw a comprehensive picture of metal-insulator
transition and dilute metallicity i... | 1902.05512v2 |
2019-02-27 | Stokes flow analogous to viscous electron current in graphene | Electron transport in two-dimensional conducting materials such as graphene,
with dominant electron-electron interaction, exhibits unusual vortex flow that
leads to a nonlocal current-field relation (negative resistance), distinct from
the classical Ohm's law. The transport behavior of these materials is best
described... | 1902.10383v1 |
2019-06-30 | Dissipative-regime measurements as a tool for confirming and characterizing near-room-temperature superconductivity | The search for new superconducting materials approaching room temperature
benefits from having a variety of testing methodologies to confirm and
characterize the presence of superconductivity. Often the first signatures of
new superconducting species occur incompletely and in very small volume
fractions. These trace am... | 1907.00425v1 |
2019-07-08 | Theory of Spin Injection in Two-dimensional Metals with Proximity-Induced Spin-Orbit Coupling | Spin injection is a powerful experimental probe into a wealth of
nonequilibrium spin-dependent phenomena displayed by materials with spin-orbit
coupling (SOC). Here, we develop a theory of coupled spin-charge diffusive
transport in two-dimensional spin-valve devices. The theory describes a
realistic proximity-induced S... | 1907.03727v1 |
2019-07-09 | Low-Temperature Dielectric Anomalies at the Mott Insulator-Metal Transition | The correlation-driven Mott transition is commonly characterized by a drop in
resistivity across the insulator-metal phase boundary; yet, the complex
permittivity provides a deeper insight into the microscopic nature. We
investigate the frequency- and temperature-dependent dielectric response of the
Mott insulator $\ka... | 1907.04437v2 |
2019-07-20 | Generating Optimal Grasps Under A Stress-Minimizing Metric | We present stress-minimizing (SM) metric, a new metric of grasp qualities.
Unlike previous metrics that ignore the material of target objects, we assume
that target objects are made of homogeneous isotopic materials. SM metric
measures the maximal resistible external wrenches without causing fracture in
the target obje... | 1907.08749v1 |
2019-07-23 | Electronic transport in thin films of BaPbO$_3$: Unraveling two-dimensional quantum effects | Recently, perovskite related BaPbO$_3$ has attracted attention due to its
hidden topological properties and, moreover, has been used as a thin layer in
heterostructures to induce two-dimensional superconductivity. Here we
investigate the normal state electronic transport properties of thin films of
BaPbO$_3$. Temperatu... | 1907.09839v2 |
2019-07-28 | Magneto-ionic control of spin polarization in magnetic tunnel junctions | Magnetic tunnel junctions (MTJs) with Hf0.5Zr0.5O2 barriers are reported to
show both tunneling magnetoresistance effect (TMR) and tunneling
electroresistance effect (TER), displaying four resistance states by magnetic
and electric field switching. Here we show that, under electric field cycling
of large enough magnitu... | 1907.12111v1 |
2020-02-11 | On the Mechanical and Thermal Stability of Free-standing Monolayer Amorphous Carbon | Recently (C.-T. Toh et al., Nature 577, 199 (2020)), the first synthesis of
free-standing monolayer amorphous carbon (MAC) was achieved. MAC is a pure
carbon structure composed of five, six, seven and eight atom rings randomly
distributed. MAC proved to be surprisingly stable and highly fracture
resistant. Its electron... | 2002.04682v1 |
2020-02-28 | Evidence for metastable photo-induced superconductivity in K$_3$C$_{60}$ | Far and mid infrared optical pulses have been shown to induce non-equilibrium
unconventional orders in complex materials, including photo-induced
ferroelectricity in quantum paraelectrics, magnetic polarization in
antiferromagnets and transient superconducting correlations in the normal state
of cuprates and organic co... | 2002.12835v1 |
2020-03-20 | Quantum Fluctuations in the Non-Fermi Liquid System CeCo$_{2}$Ga$_{8}$ Investigated Using $μ$SR | Reduced dimensionality offers a crucial information in deciding the type of
the quantum ground state in heavy fermion materials. Here we have examined
stoichiometric CeCo$_{2}$Ga$_{8}$ compound, which crystallizes in a
quasi-one-dimensional crystal structure with Ga-Ce-Co chains along the
$c$-axis. The low-temperature ... | 2003.09104v1 |
2020-03-28 | Superconductivity in the nonsymmorphic line-nodal compound CaSb$_2$ | We found superconductivity in CaSb$_2$ with the transition temperature of 1.7
K by means of electrical-resistivity, magnetic-susceptibility, and
specific-heat measurements. This material crystallizes in a nonsymmorphic
structure and is predicted to have multiple Dirac nodal lines in the bulk
electronic band structure p... | 2003.12800v1 |
2020-02-25 | Advanced protection against environmental degradation of silver mirror stacks for space application | Protection of silver mirror stacks from environmental degradation before
launching is crucial for space applications. Hereby, we report a comparative
study of the advanced protection of silver mirror stacks for space telescopes
provided by SiO2 and Al2O3 coatings in conditions of accelerated aging by
sulfidation. The m... | 2004.06590v1 |
2020-04-20 | Lindemann unjamming of emulsions | We study the bulk and shear elastic properties of barely-compressed,
"athermal" emulsions and find that the rigidity of the jammed solid fails at
remarkably large critical osmotic pressures. The minuscule yield strain and
similarly small Brownian particle displacement of solid emulsions close to this
transition suggest... | 2004.09594v2 |
2020-09-07 | Quantum Sensing of Insulator-to-Metal Transitions in a Mott Insulator | Nitrogen vacancy (NV) centers, optically-active atomic defects in diamond,
have attracted tremendous interest for quantum sensing, network, and computing
applications due to their excellent quantum coherence and remarkable
versatility in a real, ambient environment. Taking advantage of these
strengths, we report on NV-... | 2009.02886v1 |
2020-09-09 | Population Dynamics Model and Analysis for Bacteria Transformation and Conjugation | We present a two-species population model in a well-mixed environment where
the dynamics involves, in addition to birth and death, changes due to
environmental factors and inter-species interactions. The novel dynamical
components are motivated by two common mechanisms for developing antibiotic
resistance in bacteria: ... | 2009.04276v1 |
2020-09-28 | Two-dimensional Janus van der Waals heterojunctions: a review of recent research progresses | Two-dimensional Janus van der Waals (vdW) heterojunctions, referring to the
junction containing at least one Janus material, are found to exhibit tuneable
electronic structures, wide light adsorption spectra, controllable contact
resistance, and sufficient redox potential due to the intrinsic polarization
and unique in... | 2009.12985v1 |
2022-02-11 | Unusual electrical and magnetic properties in layered EuZn2As2 | Eu-based compounds often exhibit unusual magnetism, which is critical for
nontrivial topological properties seen in materials such as EuCd2As2. We
investigate the structure and physical properties of EuZn2As2 through
measurements of the electrical resistivity, Hall effect, magnetization, and
neutron diffraction. Our da... | 2202.05884v1 |
2022-02-16 | Emergence of Intergranular Tunneling Dominated Negative Magnetoresistance in Helimagnetic Manganese Phosphide Nanorod Thin Films | Helical magnets are emerging as a novel class of materials for spintronics
and sensor applications; however, research on their charge and spin transport
properties in a thin film form is less explored. Herein, we report the
temperature and magnetic field dependent charge transport properties of a
highly crystalline MnP... | 2202.07915v1 |
2014-01-30 | Infrared luminescence in Bi-doped Ge-S and As-Ge-S chalcogenide glasses and fibers | Experimental and theoretical studies of spectral properties of chalcogenide
Ge-S and As-Ge-S glasses and fibers are performed. A broad infrared (IR)
luminescence band which covers the 1.2-2.3~$\mu$m range with a lifetime about
6~$\mu$s is discovered. Similar luminescence is also present in optical fibers
drawn from the... | 1401.7815v1 |
2016-03-02 | Energy filtering enhancement of thermoelectric performance of nanocrystalline Cr-Si composites | We report on thermoelectric properties of nanocrystalline Cr$_{\rm
1-x}$Si$_{\rm x}$ composite films. As-deposited amorphous films were
transformed into a nanocrystalline state with average grain size of 10--20~nm
by annealing during in-situ thermopower and electrical resistivity
measurements. The partially crystallize... | 1603.00626v4 |
2016-03-07 | Tuning of thermoelectric properties with changing Se content in Sb2Te3 | Polycrystalline Sb 2 Te 3-x Se x (0.0 < x < 1.0) samples were synthesized by
the solid state reaction method. The structural analysis showed that up to the
maximal concentration of Se, the samples possess the Rhombohedral crystal
symmetry (space group R 3 m ). Increase of Se content increases the resistivity
of the sam... | 1603.01998v1 |
2016-03-28 | Mechanism for the Large Conductance Modulation in Electrolyte-gated Thin Gold Films | Electrolyte gating using ionic liquid electrolytes has recently generated
considerable interest as a method to achieve large carrier density modulations
in a variety of materials. In noble metal thin films, electrolyte gating
results in large changes in sheet resistance. The widely accepted mechanism for
these changes ... | 1603.08286v1 |
2017-04-05 | Superconductivity at 33 - 37 K in $ALn_2$Fe$_4$As$_4$O$_2$ ($A$ = K and Cs; $Ln$ = Lanthanides) | We have synthesized 10 new iron oxyarsenides, K$Ln_2$Fe$_4$As$_4$O$_2$ ($Ln$
= Gd, Tb, Dy, and Ho) and Cs$Ln_2$Fe$_4$As$_4$O$_2$ ($Ln$ = Nd, Sm, Gd, Tb, Dy,
and Ho), with the aid of lattice-match [between $A$Fe$_2$As$_2$ ($A$ = K and
Cs) and $Ln$FeAsO] approach. The resultant compounds possess hole-doped
conducting dou... | 1704.01488v1 |
2017-04-09 | Properties of In-Plane Graphene/MoS2 Heterojunctions | The graphene/MoS2 heterojunction formed by joining the two components
laterally in a single plane promises to exhibit a low-resistance contact
according to the Schottky-Mott rule. Here we provide an atomic-scale
description of the structural, electronic, and magnetic properties of this type
of junction. We first identi... | 1704.02669v1 |
2017-04-11 | Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN | We report neutron diffraction and transport results on the newly discovered
superconducting nitride ThFeAsN with $T_c=$ 30 K. No magnetic transition, but a
weak structural distortion around 160 K, is observed cooling from 300 K to 6 K.
Analysis on the resistivity, Hall transport and crystal structure suggests this
mate... | 1704.03119v1 |
2017-04-29 | Infrared-transmittance tunable metal-insulator conversion device with thin-film-transistor-type structure on a glass substrate | Infrared (IR) transmittance tunable metal-insulator conversion was
demonstrated on glass substrate by using thermochromic vanadium dioxide (VO2)
as the active layer in three-terminal thin-film-transistor-type device with
water-infiltrated glass as the gate insulator. Alternative positive/negative
gate-voltage applicati... | 1705.00130v1 |
2017-05-02 | Nodeless superconductivity and the peak effect in the quasi-skutterudites $\mathrm{Lu}_3\mathrm{Os}_4\mathrm{Ge}_{13}$ and $\mathrm{Y}_3\mathrm{Ru}_4\mathrm{Ge}_{13}$ | We report an investigation of the superconducting states of
$\mathrm{Lu}_3\mathrm{Os}_4\mathrm{Ge}_{13}$ and
$\mathrm{Y}_3\mathrm{Ru}_4\mathrm{Ge}_{13}$ single crystals by measurements of
the electrical resistivity, ac susceptibility and London penetration depth. The
analysis of the penetration depth and the derived su... | 1705.00818v1 |
2017-05-15 | Novel metal-insulator-transition at the SrTiO3/SmTiO3 interface | We report on a metal-insulator transition (MIT) that is observed in an
electron system at the SmTiO3/SrTiO3 interface. This MIT is characterized by an
abrupt transition at a critical temperature, below which the resistance changes
by more than an order of magnitude. The temperature of the transition
systematically depe... | 1705.05447v1 |
2017-07-11 | Strain-dependent solid surface stress and the stiffness of soft contacts | Surface stresses have recently emerged as a key player in the mechanics of
highly compliant solids. The classic theories of contact mechanics describe
adhesion with a compliant substrate as a competition between surface energies
driving deformation to establish contact and bulk elasticity resisting this.
However, it ha... | 1707.03089v1 |
2017-08-02 | Review on Modeling of Mechanical and Thermal Properties of Nano- and Micro-Composites | This article deals with the prediction of thermomechanical properties of
fiber reinforced composites using several micromechanics models. These include
strength of material approach, Halpin-Tsai equations, multi-phase mechanics of
materials approaches, multi-phase Mori-Tanaka models, composite cylindrical
assemblage mo... | 1708.00764v1 |
2017-08-10 | Observation of two-dimensional Fermi surface and Dirac dispersion in YbMnSb$_2$ | We present the crystal structure, electronic structure, and transport
properties of the material YbMnSb$_2$, a candidate system for the investigation
of Dirac physics in the presence of magnetic order. Our measurements reveal
that this system is a low-carrier-density semimetal with a 2D Fermi surface
arising from a Dir... | 1708.03308v1 |
2018-08-06 | Short Note on Superconductivity at Ambient Temperature and Pressure in Silver Embedded Gold Nano-particles: A Goldsmith job ahead | Very recent observation of superconductivity in both transport (resistance
versus temperature) and magnetization (Zero field cooled) at around 235 K has
obviously raised many eyebrows. The experimental fraternity in particular is
more thrilled. Although the results presented in the paper are clean and both
transport an... | 1808.01797v2 |
2018-08-12 | A Facile Approach to Prepare Self-Assembled, Nacre-Inspired Clay/Polymer Nano-Composites | Nature provides many paradigms for the design and fabrication of artificial
composite materials. Inspired by the relationship between the well-ordered
architecture and biopolymers found in natural nacre, we present a facile
strategy to construct large-scale organic/inorganic nacre-mimetics with
hierarchical structure v... | 1808.03972v1 |
2019-03-16 | Fundamental limits to radiative heat transfer: the limited role of nanostructuring in the near field | In a complementary article, we exploited algebraic properties of Maxwell's
equations and fundamental principles such as electromagnetic reciprocity and
passivity, to derive fundamental limits to radiative heat transfer applicable
in near- through far-field regimes. The limits depend on the choice of material
susceptibi... | 1903.07968v3 |
2019-04-17 | Low temperature saturation of phase coherence length in topological insulators | Implementing topological insulators as elementary units in quantum
technologies requires a comprehensive understanding of the dephasing mechanisms
governing the surface carriers in these materials, which impose a practical
limit to the applicability of these materials in such technologies requiring
phase coherent trans... | 1904.08517v1 |
2019-08-28 | A Cantilever Torque Magnetometry Method for the Measurement of Hall Conductivity of Highly Resistive Samples | We present the first measurements of Hall conductivity utilizing a new torque
magnetometry method designed for insulators. A Corbino disk exhibits a magnetic
dipole moment proportional to Hall conductivity when voltage is applied across
a test material. This magnetic dipole moment can be measured through torque
magneto... | 1908.10857v3 |
2011-04-18 | Manipulation of heat current by the interface between graphene and white graphene | We investigate the heat current flowing across the interface between graphene
and hexagonal boron nitride (so-called white graphene) using both molecular
dynamics simulation and nonequilibrium Green's function approaches. These two
distinct methods discover the same phenomena that the heat current is reduced
linearly w... | 1104.3371v2 |
2012-06-17 | The efficiency and power of the martensite rotor heat engine. I | The physical aspects - mechanics and thermodynamics - of operation of
martensite rotor heat engine (MRHE) on the basis of martensite-austenite
structural phase transition with the transition temperature in the region of
low-potential water temperatures have been studied. The engine converts the
thermal energy of low-po... | 1206.3733v1 |
2012-06-29 | Synthesis of a new alkali metal-organic solvent intercalated iron selenide superconductor with Tc{\approx}45K | We report on a new iron selenide superconductor with a TC onset of 45K and
the nominal composition Lix(C5H5N)yFe2-zSe2, synthesized via intercalation of
dissolved alkaline metal in anhydrous pyridine at room temperature. This
superconductor exhibits a broad transition, reaching zero resistance at 10K.
Magnetization mea... | 1206.7022v1 |
2015-06-04 | Thermal conductivity of bulk and nanoscaled Si/Ge alloys from the Kinetic Collective Model | Several hitherto unexplained features of thermal conductivity in group IV
materials, such as the change in the slope as a function of sample size for
pure vs. alloyed samples and the fast decay in thermal conductivity for low
impurity concentration, are described in terms of a transition from a
collective to kinetic re... | 1506.01522v2 |
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