publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
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2018-12-18 | An application of extensions of the Ramo-Shockley theorem to signals in silicon sensors | We discuss an extension of the Ramo-Shockley theorem that allows the
calculation of signals in detectors that contain non-linear materials of
arbitrary permittivity and finite conductivity (volume resistivity) as well as
a static space-charge. The readout-electrodes can be connected by an arbitrary
impedance network. T... | 1812.07570v2 |
2018-12-19 | Blue (In,Ga)N Light-Emitting Diodes with Buried n+-p+ Tunnel Junctions by Plasma-Assisted Molecular Beam Epitaxy | Blue light-emitting diodes (LEDs) consisting of a buried n+-p+ GaN tunnel
junction, (In,Ga)N multiple quantum wells (MQWs) and a n+-GaN top layer are
grown on single-crystal Ga-polar n+-GaN bulk wafers by plasma-assisted
molecular beam epitaxy. The (In,Ga)N MQW active regions overgrown on the p+-GaN
show chemically abr... | 1812.07708v1 |
2019-01-07 | Growth and Characterization of Fe0.95Se0.6Te0.4 Single Crystal | In this paper we present the single crystal growth of Fe0.95Se0.6Te0.4 high
TC superconducting sample by the modified Bridgman technique. The x-ray
diffraction pattern shows the single crystal nature of the sample, as only
(00l) peaks are detectable. The stoichiometric composition has been verified by
energy dispersive... | 1901.01955v1 |
2019-11-06 | Low frequency imaginary impedance at the superconducting transition of 2H-NbSe$_2$ | The superconducting transition leads to a sharp resistance drop in a
temperature interval that can be a small fraction of the critical temperature
T$_c$. A superconductor exactly at T$_c$ is thus very sensitive to all kinds of
thermal perturbations, including the heat dissipated by the measurement
current. We show that... | 1911.02340v2 |
2020-01-15 | Enhanced Carrier Transport by Transition Metal Doping in WS2 Field Effect Transistors | High contact resistance is one of the primary concerns for electronic device
applications of two-dimensional (2D) layered semiconductors. Here, we explore
the enhanced carrier transport through metal-semiconductor interfaces in WS2
field effect transistors (FETs) by introducing a typical transition metal, Cu,
with two ... | 2001.05105v1 |
2020-01-20 | Electrical conduction mechanisms of metal / high-Tc superconductor (YBCO) interfaces | Current-voltage characteristics of Au~/~YBa$_2$Cu$_3$O$_{7-\delta}$
interfaces (Au/YBCO), built on optimally-doped YBCO thin films, grown by pulsed
laser deposition, were measured as a function of temperature in the 50 K to 270
K range, for two different resistance states. A non-trivial equivalent circuit
model is prop... | 2001.07237v1 |
2020-06-09 | Fluctuations superconductivity and giant negative magnetoresistance in a gate voltage tuned 2D electron liquid with strong spin-orbit impurity scattering | We present a quantitative theory of the gate-voltage tuned
superconductor-to-insulator transition (SIT) observed experimentally in the 2D
electron liquid created in the (111) interface between crystalline SrTiO_3 and
LaAlO_3 . Considering two fundamental opposing effects of Cooper-pair
fluctuations; the critical conduc... | 2006.05098v3 |
2020-08-15 | Ultrahigh Doping of Graphene Using Flame-Deposited MoO3 | The expected high performance of graphene-based electronics is often hindered
by lack of adequate doping, which causes low carrier density and large sheet
resistance. Many reported graphene doping schemes also suffer from instability
or incompatibility with existing semiconductor processing. Here we report
ultrahigh an... | 2008.06794v1 |
2020-11-13 | Large anomalous Hall angle in a topological semimetal candidate TbPtBi | The magnetotransport properties in antiferromagnetic half-Heusler single
crystals of TbPtBi, a magnetic-field-induced topological semimetal with simple
band structure, are investigated. We found that a nonmonotonic magnetic field
dependence of the anomalous Hall resistivity in a high magnetic field (B>7T),
which come f... | 2011.06864v1 |
2021-03-09 | Anisotropy of the In-Plane and Out-of-Plane Resistivity and the Hall Effect in the Normal State of Vicinal-Grown YBa$_{2}$Cu$_{3}$O$_{7-δ}$ Thin Films | The resistivity and the Hall effect in the copper-oxide high-temperature
superconductor YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ (YBCO) are remarkably
anisotropic. Using a thin film of YBCO grown on an off-axis cut SrTiO$_3$
substrate allows one to investigate these anisotropic transport properties in a
planar and well-defined ... | 2103.05511v1 |
2021-06-24 | Erasable superconductivity in topological insulator Bi2Se3 induced by voltage pulse | Three-dimensional topological insulators (TIs) attract much attention due to
its topologically protected Dirac surface states. Doping into TIs or their
proximity with normal superconductors can promote the realization of
topological superconductivity(SC) and Majorana fermions with potential
applications in quantum comp... | 2106.13207v1 |
2021-06-29 | Low Resistance III-V Hetero-contacts to N-Ge | We experimentally study III-V/Ge heterostructure and demonstrate InGaAs
hetero-contacts to n-Ge with a wide range of In % and achieve low contact
resistivity ($\rho_C$) of $5\times10^{-8} \Omega\cdot cm^2$ for Ge doping of $3
\times 10^{19} cm^{-3}$. This results from re-directing the charge neutrality
level (CNL) near... | 2106.15099v1 |
2021-09-08 | Unusual Magnetic Properties in Layered Magnetic Topological Insulator EuSn2As2 | EuSn2As2 with layered rhombohedral crystal structure is proposed to be a
candidate of intrinsic antiferromagnetic (AFM) topological insulator. Here, we
have investigated systematic magnetoresistance (MR) and magnetization
measurements on the high quality EuSn2As2 single crystal with the magnetic
field both parallel and... | 2109.03414v1 |
2022-05-12 | Shubnikov-de Haas and de Haas-van Alphen oscillation in Czochralski grown CoSi single crystal | Anisotropic transport, Shubnikov-de Haas (SdH), and de Haas-van Alphen (dHvA)
quantum oscillations studies are reported on a high-quality CoSi single crystal
grown by the Czochralski method. Temperature-dependent resistivities indicate
the dominating electron-electron scattering. Magnetoresistance (MR) at 2 K
reaches 6... | 2205.05881v1 |
2022-07-05 | Anderson localization crossover in 2D Si systems: The past and the present | Using Ioffe-Regel-Mott (IRM) criterion for strong localization crossover in
disordered doped 2D electron systems, we theoretically study the relationships
among the three key experimentally determined localization quantities: critical
density ($n_\mathrm{c}$), critical resistance ($\rho_\mathrm{c}$), and sample
quality... | 2207.02220v1 |
2022-08-22 | Electronic structure and physical properties of EuAuAs single crystal | High-quality single crystals of EuAuAs were studied by means of powder x-ray
diffraction, magnetization, magnetic susceptibility, heat capacity, electrical
resistivity and magnetoresistance measurements. The compound crystallizes with
a hexagonal structure of the ZrSiBe type (space group $P6_3/mmc$). It orders
antiferr... | 2208.10405v1 |
2022-09-18 | Superparamagnetic and metal-like Ru2TiGe: a propitious thermoelectric material | We report a study of structural, magnetic, heat capacity and thermoelectric
properties of a Rubased Heusler alloy, Ru2TiGe. The magnetic measurements
reveal that at higher temperatures, diamagnetic and Pauli paramagnetic
contributions dominate the magnetic behaviour whereas, at lower temperatures
(T<= 20 K), superparam... | 2209.08474v1 |
2022-11-02 | Umklapp electron-electron scattering in bilayer graphene moiré superlattice | Recent experimental advances have been marked by the observations of
ballistic electron transport in moir\'e superlattices in highly aligned
heterostructures of graphene and hexagonal boron nitride (hBN). Here, we
predict that a high-quality graphene bilayer aligned with an hBN substrate
features $T^2$-dependent resist... | 2211.01005v1 |
2023-01-11 | Application of the partial Dirichlet-Neumann contact algorithm to simulate low-velocity impact events on composite structures | Impact simulations for damage resistance analysis are computationally
intensive due to contact algorithms and advanced damage models. Both methods,
which are the main ingredients in an impact event, require refined meshes at
the contact zone to obtain accurate predictions of the contact force and damage
onset and propa... | 2301.05552v2 |
2023-01-19 | Unusual anisotropic magnetoresistance due to magnetization-dependent spin-orbit interactions | One of recent surprising discoveries is the unusual anisotropic
magnetoresistance (UAMR) that depends on two magnetization components
perpendicular to the current differently, in contrast to the conventional
anisotropic magnetoresistance (AMR) that predicts no change in resistance when
the magnetization varies in the p... | 2301.07886v1 |
2023-03-06 | Timing resistive plate chambers for thermal neutron detection with 3D position sensitivity | An optimized design of a neutron detector based on timing RPCs (Resistive
Plate Chambers) with boron-10 neutron converters is presented. The detector is
composed of a stack of ten double gap RPCs with aluminium cathode plates coated
on both sides with $^{10}B_{4}C$. This design enables simultaneous
determination with h... | 2303.03461v1 |
2023-03-22 | Effect of gamma radiation on electrical properties of diffusive memristor devices | Diffusive memristors continue to receive tremendous interest due to their
ability to emulate biological neurons and thus aid the development of
bio-inspired computation technology. A major issue with the diffusive memristor
is the inability to reliably control the formation of the conduction filaments
which affects bot... | 2303.12762v1 |
2023-07-18 | Universal scaling near band-tuned metal-insulator phase transitions | We present a theory for band-tuned metal-insulator transitions based on the
Kubo formalism. Such a transition exhibits scaling of the resistivity curves,
in the regime where $T\tau >1$ or $\mu \tau>1$, where $\tau$ is the scattering
time and $\mu$ the chemical potential. At the critical value of the chemical
potential,... | 2307.09292v1 |
2023-10-10 | The black hole to black hole phase transition probed by the D3-D7 model fermionic spectral functions | We consider the D3-D7 model and analyze the phase transition from the
black-hole phase to another black-hole phase using the spectral function of a
probe fermion on D7 in the presence of the finite density and temperature. From
the fermionic spectral functions, we study the temperature dependence of the
decay rate and ... | 2310.06317v1 |
2023-10-22 | Electrical conductivity enhancement of epitaxially grown TiN thin films | Titanium nitride (TiN) presents superior electrical conductivity with
mechanical and chemical stability and compatibility with the semiconductor
fabrication process. Here, we fabricated epitaxial and polycrystalline TiN
(111) thin films on MgO (111), sapphire (001), and mica substrates at 640oC and
room temperature by ... | 2310.14208v1 |
2023-11-20 | Magnetic-field-induced nonlinear transport in HfTe5 | The interplay of electron correlations and topological phases gives rise to
various exotic phenomena including fractionalization, excitonic instability,
and axionic excitation. Recently-discovered transition-metal pentatellurides
can reach the ultra-quantum limit in low magnetic fields and serve as good
candidates for ... | 2311.11517v1 |
2023-11-29 | Lateral NbS$_2$/MoS$_2$/NbS$_2$ transistors: physical modeling and performance assessment | Reducing the contact resistance of field-effect transistors based on
two-dimensional materials is one of the key improvements required to to enable
the integration of such transistors in an industrially relevant process.
Suitably designed lateral heterojunctions provide an opportunity to
independently tailor the contac... | 2311.18031v1 |
2024-02-23 | Electrical Scanning Probe Microscope Measurements Reveal Surprisingly High Dark Conductivity in Y6 and PM6:Y6 and Non-Langevin Recombination in PM6:Y6 | We used broadband local dielectric spectroscopy (BLDS), an electric force
microscopy technique, to make non-contact measurements of conductivity in the
dark and under illumination of PM6:Y6 and Y6 prepared on ITO and PEDOT:PSS/ITO.
Over a range of illumination intensities, BLDS spectra were acquired and fit to
an imped... | 2402.15501v1 |
2021-05-07 | Integrating van der Waals materials on paper substrates for electrical and optical applications | Paper holds the promise to replace silicon substrates in applications like
internet of things or disposable electronics that require ultra-low-cost
electronic components and an environmentally friendly electronic waste
management. In the last years, spurred by the abovementioned properties of
paper as a substrate and t... | 2105.03486v1 |
2017-06-29 | Origin of Contact Resistance at Ferromagnetic Metal-Graphene Interfaces | Edge contact geometries are thought to yield ultralow contact resistances in
most non-ferromagnetic metal-graphene interfaces owing to their large
metal-graphene coupling strengths. Here, we examine the contact resistance of
edge- versus surface-contacted ferromagnetic metal-graphene interfaces (i.e.
nickel- and cobalt... | 1706.09591v1 |
2023-09-22 | Non-equilibrium Thermal Resistance of Interfaces Between III-V Compounds | Interfacial thermal resistance has been often estimated and understood using
the Landauer formalism that assumes incident phonons with equilibrium
distribution. However, previous studies suggest that phonons are
out-of-equilibrium near the interface because of the heat flow through the
leads and the scattering of phono... | 2309.13187v1 |
2003-10-28 | On magnetic field generation in Kolmogorov turbulence | We analyze the initial, kinematic stage of magnetic field evolution in an
isotropic and homogeneous turbulent conducting fluid with a rough velocity
field, v(l) ~ l^alpha, alpha<1. We propose that in the limit of small magnetic
Prandtl number, i.e. when ohmic resistivity is much larger than viscosity, the
smaller the r... | 0310780v2 |
1999-08-04 | Polarization fields in nitride nanostructures: ten points to think about | Macroscopic polarization, both of intrinsic and piezoelectric nature, is
unusually strong in III-V nitrides, and the built in electric fields in the
layers of nitride-based nanostructures, stemming from polarization changes at
heterointerfaces, have a major impact on the properties of single and multiple
quantum wells,... | 9908060v1 |
2001-02-06 | Observation of superconductivity in Y$_2$PdGe$_3$, structurally same as MgB$_2$ | The results of electrical resistance (1.4 - 300 K), magnetization (2-300 K)
and heat-capacity (2 - 50 K) measurements in Y$_2$PdGe$_3$, found to
crystallize in a AlB$_2$-derived hexagonalstructure, are reported. The results
establish that this compound is superconducting below 3 K. This obervation is
interesting consid... | 0102110v1 |
2002-05-08 | Complex Quantum Phenomena in a Bilayered Calcium Ruthenate | Ca$_3$Ru$_2$O$_7$ undergoes an antiferromagnetic transition at
$T_{\text{N}}=56 $K, followed by a Mott-like (MI) transition at
$T_{\text{MI}}=48$ K. This nonmetallic ground state, with a charge gap of 0.1
eV, is suppressed by a highly anisotropic metamagnetic transition that leads to
a fully spin-polarized metallic sta... | 0205151v1 |
2002-06-10 | Realization of La2MnVO6: Search for half-metallic antiferromagnetism? | Single-phase polycrystalline La2MnVO6 samples were synthesized by arc melting
and characterized by X-ray diffraction, magnetization and resistivity
measurements. We find that the compound has cubic (space group), partly ordered
double perovskite structure. The sample exhibits ferrimagnetic behavior and
variable-range h... | 0206146v1 |
2002-07-09 | Perspectives of superconducting MgB2 for microwave applications | We discuss the temperature, frequency, and power-dependent surface resistance
of the boride superconductor MgB2 in relation to possible applications for
passive microwave devices. The data available in the literature are compared
with results for polycrystalline Nb3Sn and epitaxial YBa2Cu3O7-x, which are
representative... | 0207226v1 |
2002-08-15 | Superconductivity in Ba_2Sn_3Sb_6 and SrSn_3Sb_4 | Resistivity and ac magnetic susceptibility measurements on Ba2Sn3Sb6 and
SrSn3Sb4 indicate that these Zintl compounds display a transition to a
superconducting phase at Tc = 3.9 K. The Meissner effect was observed for
Ba2Sn3Sb6 under an applied field of 25 Oe. The signatures for
superconductivity, such as high and low ... | 0208313v1 |
2002-11-22 | Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd2Re2O7 | Electronic properties of the metallic pyrochlore oxide Cd2Re2O7 are studied
by means of electrical resistivity and Hall measurements. Semimetallic band
structures are revealed as expected from band structure calculations. It is
found that large changes in carrier density and mass occur at the structural
phase transitio... | 0211517v1 |
2004-02-02 | Dielectric responses of the layered cobalt oxysulfide Sr_2Cu_2CoO_2S_2 with CoO_2 square-planes | We have studied the dielectric responses of the layered cobalt oxysulfide
Sr$_2$Cu$_2$CoO$_2$S$_2$ with the CoO$_2$ square-planes. With decreasing
temperature below the N\'eel temperature, the resistivity increases like a
semiconductor, and the thermopower decreases like a metal. The dielectric
constant is highly depen... | 0402034v1 |
2005-01-28 | Ce doping in T-La2CuO4 films: Broken electron-hole symmetry for high-Tc superconductivity | We attempted Ce doping in La2CuO4 with the K2NiF4 (T) structure by molecular
beam epitaxy. At low growth temperature and with an appropriate substrate
choice, we found that Ce can be incorporated into the K2NiF4 lattice up to x ~
0.06, which had not yet been realized in bulk synthesis. The doping of Ce makes
T-La2-xCex... | 0501703v1 |
2005-09-05 | Large magnetoresistance and magnetocaloric effect above 70 K in Gd2Co2Al, Gd2Co2Ga and Gd7Rh3 | The electrical resistivity, magnetization and heat-capacity behavior of the
Gd-based compounds, Gd2Co2Al, Gd2Co2Ga and Gd7Rh3, ordering magnetically at TC=
78 K, TC= 76 K and TN= 140 K have been investigated as a function of
temperature and magnetic field. All these compounds are found to show large
magnetoresistance (... | 0509107v1 |
2006-10-11 | Intergrain connectivity and resistive broadening in vortex state: a comparison between MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10 superconductors | Magnetoresistance and radio frequency penetration depth techniques are used
to study grain connectivity and broadening of superconducting transition. We
study and compare these issues in clean polycrytalline samples of three
different superconducting systems e.g. MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10. From
the rf response, t... | 0610295v1 |
2007-03-25 | Novel dynamical effects and glassy response in strongly correlated electronic system | We find an unconventional nucleation of low temperature paramagnetic metal
(PMM) phase with monoclinic structure from the matrix of high-temperature
antiferromagnetic insulator (AFI) phase with tetragonal structure in strongly
correlated electronic system $BaCo_{0.9}Ni_{0.1}S_{1.97}$. Such unconventional
nucleation lea... | 0703647v1 |
2007-07-05 | Anomalous exchange coupling in transition-metal-oxide based superlattices with antiferromagnetic spacer layers | A direct correlation is seen between the coercive field (HC) and the
magnetic-field-dependent resistivity (MR) in SrMnO3/SrRuO3 superlattices of
perpendicular magnetic anisotropy. The magnetoresistance shows a sharp jump at
Hc for in-plane current and the out-of-plane magnetic field. Both HC and
high-field MR also osci... | 0707.0768v1 |
2007-08-10 | Coherent quasiparticle transport in grain boundary junctions employing high-Tc superconductors | Magneto-fluctuations of the normal resistance RN have been reproducibly
observed in YBa2Cu3O7-d biepitaxial grain boundary junctions at low
temperatures. We attribute them to mesoscopic transport in narrow channels
across the grain boundary line, occurring in an unusual energy regime. The
Thouless energy appears to be ... | 0708.1448v1 |
2007-09-26 | Single crystal growth and anisotropy of CeRuPO | We report on the single crystal growth of the ferromagnetic Kondo lattice
system CeRuPO using a Sn flux method. Magnetic susceptibility and electrical
resistivity measurements indicate strong anisotropy of this structurally
layered compound. They evidence that the magnetic moments order
ferromagnetically along the c-di... | 0709.4144v2 |
2007-11-30 | Large voltage from spin pumping in magnetic tunnel junctions | We studied the response of a ferromagnet-insulator-normal metal tunnel
structure under an external oscillating radio frequency (R.F.) magnetic field.
The D. C. voltage across the junction is calculated and is found not to
decrease despite the high resistance of the junction; instead, it is of the
order of $\mu V$ to $1... | 0711.4939v1 |
2008-01-07 | High Performance Thermal Interface Technology Overview | An overview on recent developments in thermal interfaces is given with a
focus on a novel thermal interface technology that allows the formation of 2-3
times thinner bondlines with strongly improved thermal properties at lower
assembly pressures. This is achieved using nested hierarchical surface channels
to control th... | 0801.1046v1 |
2008-01-17 | Stability of RVB hole stripes in high-temperature superconductors | Indications of density-wave states in underdoped cuprates, coming from recent
STM (scanning tunneling microscopy) and Hall-resistance measurements, have
raised new concerns whether stripes could be stabilized in the superconducting
phase of cuprate materials, even in the absence of antiferromagnetism. Here, we
investig... | 0801.2722v2 |
2008-08-03 | Superconductivity in Yttrium Iron Oxyarsenide System | Iron-based oxypnictides substituted with yttrium have been prepared via a
conventional solid state reaction. The product after first 50 hours of reaction
showed diamagnetic-like transition at around 10 K but was not superconducting,
while additional 72 hours of high temperature heat treatment was required to
yield supe... | 0808.0288v2 |
2008-09-16 | Interface heat transfer between crossing carbon nanotubes, and the thermal conductivity of nanotube pellets | We theoretically compute the interface thermal resistance between crossing
single walled carbon nanotubes of various chiralities, using an atomistic
Green's function approach with semi-empirical potentials. The results are then
used to model the thermal conductivity of three dimensional nanotube pellets in
vacuum. For ... | 0809.2660v1 |
2008-10-29 | High-Mobility Few-Layer Graphene Field Effect Transistors Fabricated on Epitaxial Ferroelectric Gate Oxides (Supplementary Information) | Supplementary Information to arXiv:0810.4466: 1. Characterizations of
Pb(Zr_0.2Ti_0.8)O_3 (PZT) films. 2. Substrate preparation before the
exfoliation of graphene. 3. The band structure of FLG. 4. Dielectric constant
measurements of PZT. 5. rho(V_g) and R_H(V_g) fitting inside the band overlap
regime. 6. The deformatio... | 0810.5339v1 |
2008-12-20 | Mobility Extraction and Quantum Capacitance Impact in High Performance Graphene Field-effect Transistor Devices | The field-effect mobility of graphene devices is discussed. We argue that the
graphene ballistic mean free path can only be extracted by taking into account
both, the electrical characteristics and the channel length dependent mobility.
In doing so we find a ballistic mean free path of 300nm at room-temperature for
a c... | 0812.3927v1 |
2009-01-07 | Electrically Controlled Magnetic Memory and Programmable Logic based on Graphene/Ferromagnet Hybrid Structures | It has been shown that the combining of the electrical effect on the exchange
bias field with giant magneto-resistance effect of the graphene/ferromagnet
hybrid structures reveals a new non-volatile magnetic random access memory
device conception. In such device an electric bias realizes the writing bits
instead a magn... | 0901.0926v1 |
2009-03-21 | Graphite in the bi-layer regime: in-plane transport | An interplay between the increase in the number of carriers and the decrease
in the scattering time is expected to result in a saturation of the in-plane
resistivity, $\rho_{ab}$, in graphite above room temperature. Contrary to this
expectation, we observe a pronounced increase in $\rho_{ab}$ in the interval
between 30... | 0903.3646v2 |
2009-04-22 | Emergence of dissipative structures in current-carrying superconducting wires | We discuss the emergence of a spontaneous temperature and critical current
spatial modulation in current-carrying high temperature superconducting wire.
The modulation of the critical current along the wire on a scale of 3 - 10 mm
forces a fraction of the transport current to crisscross the resistive
interface between ... | 0904.3474v1 |
2009-04-23 | Crystal growth, structure and ferromagnetic properties of a Ce3Pt23Si11 single crystal | A high-quality single crystal of Ce3Pt23Si11 has been grown using the
Czochralski method. The crystal structure is presented and the chemical
composition has been checked using an electron microprobe analyzer.
Measurements of the electrical resistivity and magnetic susceptibility
performed at low temperature show a fer... | 0904.3720v1 |
2009-05-29 | Growth of Sr1-xCaxRuO3 thin films by metalorganic aerosol deposition | We report the growth of thin films of Sr1-xCaxRuO3 on SrTiO3 and MgO
substrates by metalorganic aerosol deposition. The structure and microstructure
is characterized by X-ray diffraction and room-temperature scanning tunnelling
microscopy (STM), respectively. STM indicates in-plane epitaxy and a small
surface roughness... | 0905.4896v2 |
2009-09-07 | Anomalous magnetotransport and cyclotron resonance of high mobility magnetic 2DHGs in the quantum Hall regime | Low temperature magnetotransport measurements and far infrared transmission
spectroscopy are reported in molecular beam epitaxial grown two-dimensional
hole systems confined in strained InAs quantum wells with magnetic impurities
in the channel. The interactions of the free holes spin with the magnetic
moment of 5/2 pr... | 0909.1124v1 |
2010-08-15 | Unconventional Anomalous Hall Effect in the Metallic Triangular-Lattice Magnet PdCrO2 | We experimentally reveal an unconventional anomalous Hall effect (UAHE) in a
quasi-two-dimensional triangular-lattice antiferromagnet PdCrO2. Using high
quality single crystals of PdCrO2, we found that the Hall resistivity deviates
from the conventional behavior below T* = 20 K, noticeably lower than TN = 37.5
K, at wh... | 1008.2503v1 |
2010-08-27 | Metal-nonmetal transition in LixCoO2 thin film and thermopower enhancement at high Li concentration | We investigate the transport properties of LixCoO2 thin films whose
resistivities are nearly an order of magnitude lower than those of the bulk
polycrystals. A metal-nonmetal transition occurs at ~0.8 in a biphasic domain,
and the Seebeck coefficient (S) is drastically increased at ~140 K (= T*) with
increasing the Li ... | 1008.4635v1 |
2010-10-21 | Atomistic quantum transport modeling of metal-graphene nanoribbon heterojunctions | We calculate quantum transport for metal-graphene nanoribbon heterojunctions
within the atomistic self-consistent Schr\"odinger/Poisson scheme. Attention is
paid on both the chemical aspects of the interface bonding as well the
one-dimensional electrostatics along the ribbon length. Band-bending and doping
effects stro... | 1010.4393v1 |
2010-11-02 | Spin connection and boundary states in a topological insulator | We study the surface resistivity of a three-dimensional topological insulator
when the boundaries exhibit a non trivial curvature. We obtain an analytical
solution for a spherical topological insulator, and we show that a non trivial
quantum spin connection emerges from the three dimensional band structure. We
analyze ... | 1011.0565v1 |
2010-11-20 | Imaging Dissipation and Hot Spots in Carbon Nanotube Network Transistors | We use infrared thermometry of carbon nanotube network (CNN) transistors and
find the formation of distinct hot spots during operation. However, the average
CNN temperature at breakdown is significantly lower than expected from the
breakdown of individual nanotubes, suggesting extremely high regions of power
dissipatio... | 1011.4551v2 |
2011-05-16 | Coulomb drag in graphene | We calculate theoretically the Coulomb drag resistivity for two graphene
monolayers spatially separated by a distance "$d$". We show that the frictional
drag induced by inter-layer electron-electron interaction goes asymptotically
as $T^2/n^3$ and $T^2 \ln(n)/n$ in the high-density ($k_F d \gg 1$) and
low-density ($k_F... | 1105.3203v2 |
2011-07-23 | Modified exponential I(U) dependence and optical efficiency of AlGaAs SCH lasers in computer modeling with Synopsys TCAD | Optical and electrical characteristics of AlGaAs lasers with separate
confinement heterostructures are modeled by using Synopsys's Sentaurus TCAD,
and open source software. We propose a modified exponential $I-V$ dependence to
describe electrical properties. A simple analytical, phenomenological model is
found to descr... | 1107.4668v1 |
2011-08-20 | Demonstration of Forward Inter-band Tunneling in GaN by Polarization Engineering | We report on the design, fabrication, and characterization of GaN interband
tunnel junction showing forward tunneling characteristics. We have achieved
very high forward tunneling currents (153 mA/cm2 at 10 mV, and 17.7 A/cm2 peak
current) in polarization-engineered GaN/InGaN/GaN heterojunction diodes grown
by plasma a... | 1108.4075v1 |
2012-04-10 | Tunneling conduction in graphene/(poly)vinyl alcohol composites | Graphene/(Poly)vinyl alcohol (PVA) composite film with thickness $60 \mu m$
were synthesized by solidification of a PVA solution comprising of dispersed
graphene nanosheets. The close proximity of the graphene sheets enables the
fluctuation induced tunneling of electrons to occur from one sheet to another.
The dielectr... | 1204.2126v2 |
2012-07-27 | Theoretical model of structure-dependent conductance crossover in disordered carbon | We analyze the effects of sp^2/sp^3 bond-aspect ratio on the transport
properties of amorphous carbon quasi-1D structures where structural disorder
varies in a very non-linear manner with the effective bandgap. Using a
tight-binding approach the calculated electron transmission showed a high
probability over a wide reg... | 1207.6478v1 |
2012-11-22 | Physical properties and band structure of reactive molecular beam epitaxy grown oxygen engineered HfO$_{2\pm x}$ | We have conducted a detailed thin film growth structure of oxygen engineered
monoclinic HfO$_{2\pm x}$ grown by reactive molecular beam epitaxy (MBE). The
oxidation conditions induce a switching between ($\bar{1}11$) and (002) texture
of hafnium oxide. The band gap of oxygen deficient hafnia decreases with
increasing a... | 1211.5215v1 |
2013-05-21 | High sensitive quasi freestanding epitaxial graphene gassensor on 6H-SiC | We have measured the electrical response to NO$_2$, N$_2$, NH$_3$ and CO for
epitaxial graphene and quasi freestanding epitaxial graphene on 6H-SiC
substrates. Quasi freestanding epitaxial graphene shows a 6 fold increase in
NO2 sensitivity compared to epitaxial graphene. Both samples show a sensitivity
better than the... | 1305.4737v1 |
2013-09-04 | Enhancing high-temperature thermoelectric properties of PtAs2 by Rh doping | The effects of Rh doping on the thermoelectric properties of Pt1-xRhxAs2 (x =
0, 0.005, and 0.01) with pyrite structure were studied by conducting
measurements of electrical resistivity rho, Seebeck coefficient S, and thermal
conductivity kappa. The sample with x = 0.005 exhibited large S and low rho,
resulting in a ma... | 1309.0939v1 |
2013-10-06 | Charge transport through graphene junctions with wetting metal leads | Graphene is believed to be an excellent candidate material for
next-generation electronic devices. However, one needs to take into account the
nontrivial effect of metal contacts in order to precisely control the charge
injection and extraction processes. We have performed transport calculations
for graphene junctions ... | 1310.1640v1 |
2013-11-17 | Giant magnetothermopower in charge ordered Nd0.75Na0.25MnO3 | We report magnetization, resistivity and thermopower in the charge-orbital
ordered antiferromagnet Nd0.75Na0.25MnO3. Magnetic-field induced collapse of
antiferromagnetism is found to be accompanied by a giant negative
magnetothermopower (= 80-100% for a field change of 5T) over a wide temperature
(T = 60-225K) and gian... | 1311.4165v1 |
2014-02-05 | Selective molecular capture mechanism in carbon nanotube networks | Recent air pollution issues have raised significant attention to develop
efficient air filters, and one of the most promising candidates is that enabled
by nanofibers. We explore here selective molecular capture mechanism for
volatile organic compounds in carbon nanotube networks by performing atomistic
simulations. Th... | 1402.1011v1 |
2016-01-06 | Effect of SW defect on structural and transport properties of silicene nanoribbons | Using density functional theory and non-equilibrium Greens function
technique, we performed theoretical investigations on the structural and
transport properties of zigzag silicene nanoribbons with Stone-Wales defect.
The calculated formation energy is significantly lower than that of graphene
and silicene, which impli... | 1601.01053v1 |
2016-01-30 | Slippery but tough - the rapid fracture of lubricated frictional interfaces | We study the onset of friction for rough contacting blocks whose interface is
coated with a thin lubrication layer. High speed measurements of the real
contact area and stress fields near the interface reveal that propagating shear
cracks mediate lubricated frictional motion. While lubricants reduce interface
resistanc... | 1602.00085v2 |
2016-10-09 | Physical properties of KMgBi single crystals | KMgBi single crystals are grown by using the Bi flux successfully. KMgBi
shows semiconducting behavior with a metal-semiconductor transition at high
temperature region and a resistivity plateau at low temperature region,
suggesting KMgBi could be a topological insulator with a very small band gap.
Moreover, KMgBi exhib... | 1610.02699v2 |
2017-06-27 | Influence of Heat Treatment on the Corrosion Behavior of Purified Magnesium and AZ31 Alloy | Magnesium and its alloys are ideal for biodegradable implants due to their
biocompatibility and their low-stress shielding. However, they can corrode too
rapidly in the biological environment. The objective of this research was to
develop heat treatments to slow the corrosion of high purified magnesium and
AZ31 alloy i... | 1706.08663v1 |
2017-12-06 | Superconductivity in the ternary compound SrPt$_{10}$P$_4$ with complex new structure | We report superconductivity at 1.4K in the ternary SrPt$_{10}$P$_4$ with a
complex new structure. SrPt$_{10}$P$_4$ crystallizes in a monoclinic
space-group C2/c (\#15) with lattice parameters a= 22.9151(9)$\AA$, b=
13.1664(5)$\AA$, c=13.4131(5)$\AA$, and $\beta$= 90.0270(5)${^\circ}$. Bulk
superconductivity in the samp... | 1712.02010v1 |
2018-03-06 | Comparative study on magnetoresistance of carbon-cobalt nanocomposite thin films grown by pulsed laser deposition | We present a comparative study on the influence of applied magnetic field on
the resistance of $C_{1-x}Co_x$ thin films (with $x=0.1$, $0.15$ and $0.2$)
grown on $Si$ substrate by pulsed laser deposition technique. It is found that
the behavior of magnetoresistance (MR) drastically depends on the temperature.
Namely, a... | 1803.02064v1 |
2018-04-27 | Emergent antiferromagnetism of YTiO3 in YTiO3-CaTiO3 superlattices | Transport and magnetoresistance measurements are performed on metallic,
high-carrier density YTiO3-CaTiO3 superlattices as a probe towards the
investigation of an emergent magnetic order of YTiO3. On varying the thickness
of YTiO3 while keeping the CaTiO3 layer thickness constant in the
superlattices, a low-temperature... | 1804.10333v1 |
2018-10-01 | Poly(ionic liquid)-Derived Carbon with Site-Specific N-Doping and Biphasic Heterojunction for Enhanced CO2 Capture and Sensing | CO2 capture is a pressing global environmental issue that drives scientists
to develop creative strategies for tackling this challenge. The concept in this
contribution is to produce site specific nitrogen doping in microporous carbon
fibers. It creates a carbon/carbon heterojunction by using poly(ionic liquid)
(PIL) a... | 1810.06418v1 |
2020-09-13 | Adiabatic theory of SET and RESET transitions | We develop a phenomenological theory of pulse induced phase transformations
behind the SET (from high to low resistive state) and RESET (backward)
processes in nonvolatile memory. We show that in modern era devices, both
evolve in the adiabatic regime with energy deposition time much shorter than
that of thermalization... | 2009.06057v2 |
2007-10-29 | Thermoelectrical manipulation of nano-magnets | We propose a device that can operate as a magneto-resistive switch or
oscillator. The device is based on a spin-thermo-electronic control of the
exchange coupling of two strong ferromagnets through a weakly ferromagnetic
spacer. We show that the local Joule heating due to a high concentration of
current in a magnetic p... | 0710.5477v1 |
2007-10-30 | Devitrification of a glass-like arrested ferromagnetic phase in La0.5Ca0.5MnO3 | Magnetization measurements in La0.5Ca0.5MnO3 manganite show that the
high-temperature long-range ferromagnetic-metallic phase transforms to
antiferromagnetic-insulating phase, although a fraction of
ferromagnetic-metallic phase undergoes glass-like kinetic arrest and coexists
at low temperature with the equilibrium ant... | 0710.5585v1 |
2019-03-26 | Patterning of diamond with 10 nm resolution by electron-beam-induced etching | We report on mask-less, high resolution etching of diamond surfaces,
featuring sizes down to 10 nm. We use a scanning electron microscope (SEM)
together with water vapor, which was injected by a needle directly onto the
sample surface. Using this versatile and low-damage technique, trenches with
different depths were e... | 1903.10824v1 |
2015-07-11 | Insulator/metal phase transition and colossal magnetoresistance in holographic model | Within massive gravity, we construct a gravity dual for insulator/metal phase
transition and colossal magnetoresistance (CMR) effect found in some manganese
oxides materials. In heavy graviton limit, a remarkable
magnetic-field-sensitive DC resistivity peak appears at the Curie temperature,
where an insulator/metal pha... | 1507.03105v2 |
2019-10-23 | Percolation with plasticity for neuromorphic computing | We introduce the percolation with plasticity (PWP) systems that exhibit
neuromorphic functionalities including multi-valued memory, random number
generation, matrix-vector multiplication, and associative learning. PWP systems
have multiple (N >> 1) interfaces with external circuitry (electrodes) allowing
N! >> 1 measur... | 1910.10535v1 |
2019-11-04 | Closed-loop electric currents and non-local resistance measurements with wide F/I/N tunnel contacts | Lateral spin valves are used to generate and characterize pure spin currents.
Non-local voltage measured in such structures provides information about spin
polarization and spin decay rates. For wide high-transparency F/N contacts it
was shown that the Johnson-Silsbee non-local effect is substantially enriched
by close... | 1911.01034v1 |
2020-01-08 | Electrical and optical properties of hydrated amorphous vanadium oxide | Electrical and optical properties of amorphous vanadium oxide thin films
obtained by electrochemical anodic oxidation are studied. It is shown that
under cathodic polarization the hydrogen insertion into vanadium oxide from an
electrolyte occurs. Metal-insulator transition in amorphous HxVO2 is found to
be preserved up... | 2001.02418v1 |
2020-01-08 | Electrical conductivity of vanadium dioxide switching channel | The electrical conductivity of the switching channel of vanadium dioxide
thin-film sandwich structures is studied over a wide temperature range (15-300
K). It is shown that the electrical resistance of the channel varies with
temperature as R~exp(aT-b/T) in the high-temperature region (above 70 K). The
experimental res... | 2001.03053v1 |
2021-03-19 | Side-leakage of facemask | Face masks are used to trap particles (or fluid drops) in a porous material
(filter) in order to avoid or reduce the transfer of particles between the
human lungs (or mouth and nose) and the external environment. The air exchange
between the lungs and the environment is assumed to occur through the facemask
filter. How... | 2103.10970v1 |
2021-04-25 | High Pressure RTSC-Hydrides are Extreme Hard Type-II Superconductors | It is argued that most of the RTSC hydrides are intrinsic hard type-II
superconductors with strong pinning effects. The pinning centers are long
columnar-like defects, with the radius of the order of the superconducting
coherence length. The core and electromagnetic pinning are both equally
operative, thus giving maxim... | 2104.12214v1 |
2022-11-19 | A Large-Area RPC Detector for Muography | A muon telescope equipped with four Resistive Plate Chambers of 2 m$^{2}$ per
plane was tested with the muon scattering tomography technique. The telescope
was operated during several hours with high atomic number materials located at
its center with two detector planes on each side. With an intrinsic efficiency
above ... | 2211.10795v1 |
2023-05-22 | Microcontroller Based AVR Hazardous Gas Detection System using IoT | MQ-6 Semiconductor Sensor for Combustible Gas detection is a Sensitive Gas
sensor. The sensitive material of this MQ-6 gas sensor is SnO2, which works
with lower conductivity in clean air. When the target combustible gas exist,
the sensors conductivity is higher along with the gas concentration rising. As
the conductiv... | 2305.12855v1 |
2017-10-25 | High-temperature cyclic oxidation kinetics and microstructural transition mechanisms of Ti-6Al-4V composites reinforced with hybrid (TiC+TiB) networks | The microstructural features and high-temperature oxidation resistance of
hybrid (TiC+TiB) networks reinforced Ti-6Al-4V composites were investigated
after fabricated with reaction hot pressing technique. The inhomogeneous
distribution of hybrid reinforcers resulted in a sort of stress-induced grain
refinement for {\al... | 1710.09315v1 |
2007-07-20 | A mechanism for unipolar resistance switching in oxide non-volatile memory devices | Building on a recently introduced model for non-volatile resistive switching,
we propose a mechanism for unipolar resistance switching in
metal-insulator-metal sandwich structures. The commutation from the high to low
resistance state and back can be achieved with successive voltage sweeps of the
same polarity. Electro... | 0707.3077v1 |
2013-08-02 | Precision Quantum Hall Resistance Measurement on Epitaxial Graphene Device in Low Magnetic Field | Precision quantum Hall resistance (QHR) measurements were performed on
large-area epitaxial graphene device at low magnetic fields (B = 2 T - 8 T) at
temperature T = 1.5 K. Hall resistance was measured using Cryogenic Current
Comparator resistance bridge with high biasing current Isd = 40 micro ampere.
The results show... | 1308.0456v1 |
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