publicationDate stringlengths 10 10 | title stringlengths 17 233 | abstract stringlengths 20 3.22k | id stringlengths 9 12 |
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2016-10-18 | Light emission, light detection and strain sensing with nanocrystalline graphene | Graphene is of increasing interest for optoelectronic applications exploiting
light detection, light emission and light modulation. Intrinsically light
matter interaction in graphene is of a broadband type. However by integrating
graphene into optical micro cavities also narrow band light emitters and
detectors have be... | 1610.05513v1 |
2017-02-01 | Pore ordering in mesoporous matrices induced by different directing agents | Mesoporous silica particles of MCM-41 type were synthesized by sol-gel method
from tetraethyl orthosilicate (TEOS) in 2-methoxyethanol and deionized water
mixture in base conditions at room temperature. Ammonia or sodium hydroxides
were used as catalysts and cetyl-trimethylammonium bromide (CTAB) and
n-dodecyl-trimethy... | 1702.00366v1 |
2017-10-27 | Materials considerations for forming the topological insulator phase in InAs/GaSb heterostructures | In an ideal InAs/GaSb bilayer of appropriate dimension in-plane electron and
hole bands overlap and hybridize, and a topologically non-trivial, or quantum
spin Hall (QSH) insulator, phase is predicted to exist. The in-plane
dispersion's potential landscape, however, is subject to microscopic
perturbations originating f... | 1710.10095v1 |
2014-08-05 | Emergent surface superconductivity of nanosized Dirac puddles in a topological insulator | Surfaces of three-dimensional topological insulators have emerged as one of
the most remarkable states of condensed quantum matter1-5 where exotic
electronic phases of Dirac particles should arise1,6-8. Here we report a
discovery of surface superconductivity in a topological material (Sb2Te3) with
resistive transition ... | 1408.1046v1 |
2019-07-31 | Coexisting 1T/2H polymorphs, reentrant resistivity behavior, and charge distribution in MoS2-hBN 2D/2D composite thin films | In view of their immensely intriguing properties, two dimensional materials
are being intensely researched in search of novel phenomena and diverse
application interests, however, studies on the realization of nanocomposites in
the application-worthy thin-film platform are rare. Here we have grown MoS2-hBN
composite th... | 1907.13522v1 |
2022-02-21 | Towards fully two-dimensional spintronic devices | Within the field of spintronics major efforts are directed towards developing
applications for spin-based transport devices made fully out of two-dimensional
(2D) materials. In this work we present an experimental realization of a
spin-valve device where the generation of the spin signal is exclusively
attributed to th... | 2202.09972v1 |
2016-03-10 | Möbius Kondo Insulators | Heavy fermion materials have recently attracted attention for their potential
to combine topological protection with strongly correlated electron physics. To
date, the ideas of topological protection have been restricted to the heavy
fermion or "Kondo" insulators with the simplest point-group symmetries. Here we
argue ... | 1603.03435v4 |
2017-07-14 | Mesoscale simulations of confined Nafion thin films | The morphology and transport properties of thin films of the ionomer Nafion,
with thicknesses on the order of the bulk cluster size, have been investigated
as a model system to explain the anomalous behaviour of
catalyst/electrode-polymer interfaces in membrane-electrode assemblies. We have
employed dissipative particl... | 1707.04604v3 |
2017-07-27 | SRF Theory Developments from the Center for Bright Beams | We present theoretical studies of SRF materials from the Center for Bright
Beams. First, we discuss the effects of disorder, inhomogeneities, and
materials anisotropy on the maximum parallel surface field that a
superconductor can sustain in an SRF cavity, using linear stability in
conjunction with Ginzburg-Landau and ... | 1707.09025v1 |
2019-12-13 | Strength, transformation toughening and fracture dynamics of rocksalt-structure Ti1-xAlxN (0 <= x <= 0.75) alloys | Ab initio-calculated ideal strength and toughness describe the upper limits
for mechanical properties attainable in real systems and can, therefore, be
used in selection criteria for materials design. We employ density-functional
ab initio molecular dynamics (AIMD) to investigate the mechanical properties of
defect-fre... | 1912.06367v2 |
2015-04-02 | Thermoelectric Signal Enhancement by Reconciling the Spin Seebeck and Anomalous Nernst Effects in Ferromagnet/Non-magnet Multilayers | The utilization of ferromagnetic (FM) materials in thermoelectric devices
allows one to have a simpler structure and/or independent control of electric
and thermal conductivities, which may further remove obstacles for this
technology to be realized. The thermoelectricity in FM/non-magnet (NM)
heterostructures using an... | 1504.00642v1 |
2018-07-02 | Electron-electron interactions of the multi-Cooper-pairs in the 1D limit and their role in the formation of global phase coherence in quasi-one-dimensional superconducting nanowire arrays | Nanostructuring of superconducting materials to form dense arrays of thin
parallel nanowires with significantly large transverse Josephson coupling has
proven to be an effective way to increase the upper critical field of
superconducting elements by as much as two orders of magnitude as compared to
the corresponding bu... | 1807.00611v1 |
2018-07-30 | Tunable Thermal Energy Transport across Diamond Membranes and Diamond-Si Interfaces by Nanoscale Graphoepitaxy | The development of electronic devices, especially those that involve
heterogeneous integration of materials, has led to increased challenges in
addressing their thermal operational-temperature demands. The heat flow in
these systems is significantly influenced or even dominated by thermal boundary
resistance at interfa... | 1807.11400v2 |
2019-10-28 | Tailored Graphenic Structures Directly Grown on Titanium Oxide Boost the Interfacial Charge Transfer | The successful application of titanium oxide-graphene hybrids in the fields
of photocatalysis, photovoltaics and photodetection strongly depends on the
interfacial contact between both materials. The need to provide a good coupling
between the enabling conductor and the photoactive phase prompted us to
directly grow co... | 1910.12667v1 |
2020-08-23 | Nanofibril-mediated Fracture Resistance of Bone | Natural hard composites like human bone possess a combination of strength and
toughness that exceeds that of their constituents and of many engineered
composites. This augmentation is attributed to their complex hierarchical
structure, spanning multiple length scales; in bone, characteristic dimensions
range from nanos... | 2008.09955v1 |
2020-10-28 | Statistical analysis of the material, geometrical and imperfection characteristics of structural stainless steels and members | Traditional member-based two-step design approaches included in current
structural codes for steel structures, as well as more recent system-based
direct-design alternatives, require building rigorous structural reliability
frameworks for the calibration of partial coefficients (resistance factors) to
achieve specified... | 2010.14777v2 |
2020-11-03 | Fully-Compensated Ferrimagnetic Spin Filter Materials within the Cr$\textit{M}\textit{N}$Al Equiatomic Quaternary Heusler Alloys | XX'YZ equiatomic quaternary Heusler alloys (EQHA's) containing Cr, Al, and
select Group IVB elements ($\textit{M}$ = Ti, Zr, Hf) and Group VB elements
($\textit{N}$ = V, Nb, Ta) were studied using state-of-the-art density
functional theory to determine their effectiveness in spintronic applications.
Each alloy is class... | 2011.01389v1 |
2020-12-02 | Strain-induced anion ordering in perovskite oxyfluoride films | Anionic ordering is a promising route to engineer physical properties in
functional heteroanionic materials. A central challenge in the study of
anion-ordered compounds lies in developing robust synthetic strategies to
control anion occupation and in understanding the resultant implications for
electronic structure. He... | 2012.01221v1 |
2021-02-06 | Multiple charge density waves and superconductivity nucleation at antiphase domain walls in the nematic pnictide Ba$_{1-x}$Sr$_{x}$Ni$_{2}$As$_{2}$ | How superconductivity interacts with charge or nematic order is one of the
great unresolved issues at the center of research in quantum materials.
Ba$_{1-x}$Sr$_{x}$Ni$_{2}$As$_{2}$ (BSNA) is a charge ordered pnictide
superconductor recently shown to exhibit a six-fold enhancement of
superconductivity due to nematic fl... | 2102.03592v2 |
2021-04-29 | Competing magnetic interactions and magnetoresistance anomalies in cubic intermetallic compounds, Gd4RhAl and Tb4RhAl, and enhanced magnetocaloric effect for the Tb case | We report complex magnetic, magnetoresistance (MR) and magnetocaloric
properties of Gd4RhAl and Tb4RhAl forming in the Gd4RhIn type cubic structure.
Though the synthesis of the compounds was reported long ago, to our knowledge,
no attempt was made to investigate the properties of these compounds. The
present results of... | 2104.14521v1 |
2021-10-12 | Bridging the Band Gap: What Device Physicists Need to Know About Machine Learning | This article surveys the landscape of semiconductor materials and devices
research for the acceleration of machine learning (ML) algorithms. We observe a
disconnect between the semiconductor and device physics and engineering
communities, and the digital logic and computer hardware architecture
communities. The article... | 2110.05910v2 |
2021-11-15 | In situ Bragg coherent X-ray diffraction imaging of corrosion in a Co-Fe alloy microcrystal | Corrosion is a major concern for many industries, as corrosive environments
can induce structural and morphological changes that lead to material
dissolution and accelerate material failure. The progression of corrosion
depends on nanoscale morphology, stress, and defects present. Experimentally
monitoring this complex... | 2111.07903v5 |
2021-12-16 | Observation and manipulation of a phase separated state in a charge density wave material | The 1T polytype of TaS$_\textrm{2}$ has been studied extensively as a
strongly correlated system. As 1T-TaS$_\textrm{2}$ is thinned towards the 2D
limit, its phase diagram shows significant deviations from that of the bulk
material. Optoelectronic maps of ultrathin 1T-TaS$_\textrm{2}$ have indicated
the presence of non... | 2112.09240v1 |
2022-03-17 | Quasi-static crack front deformations in cohesive materials | When a crack interacts with material heterogeneities, its front distorts and
adopts complex tortuous configurations that are reminiscent of the energy
barriers encountered during crack propagation. As such, the study of crack
front deformations is key to rationalize the effective failure properties of
micro-structured ... | 2203.09317v2 |
2022-05-11 | Reversible Tuning of Superconductivity in Ion-Gated NbN Ultrathin Films by Self-Encapsulation with a High-$κ$ Dielectric Layer | Ionic gating is a powerful technique for tuning the physical properties of a
material via electric field-induced charge doping, but is prone to introduce
extrinsic disorder and undesired electrochemical modifications in the gated
material beyond pure electrostatics. Conversely, reversible, volatile and
electrostatic mo... | 2205.05491v3 |
2022-06-07 | Observation of surface superconductivity in a three-dimensional Dirac material | Superconductivity becomes more interesting when it encounters dimensional
constraint or topology, because it is of importance for exploring exotic
quantum phenomena or developing superconducting electronics. Here we report the
coexistence of naturally formed surface superconducting state and
three-dimensional topologic... | 2206.03405v1 |
2022-10-03 | Interwoven atypical quantum states in CeLiBi$_2$ | We report the discovery of CeLiBi$_2$, the first example of a material in the
tetragonal Ce$TX_2$ ($T$ = transition metal; $X$ = pnictogen) family wherein an
alkali cation replaces the typical transition metal. Magnetic susceptibility
and neutron powder diffraction measurements are consistent with a crystal-field
$\Gam... | 2210.01031v2 |
2022-11-27 | Ionic Peltier Effect in Li-Ion Electrolytes | The coupled transport of charge and heat provide fundamental insights into
the microscopic thermodynamics and kinetics of materials. We describe a
sensitive ac differential resistance bridge that enables measurements of the
temperature difference on two sides of a coin cell with a resolution of better
than 10 uK. We us... | 2211.14949v2 |
2023-03-28 | A model for critical current effects in point-contact Andreev-reflection spectroscopy | It is well known that point-contact Andreev reflection spectroscopy provides
reliable measurements of the energy gap(s) in a superconductor when the contact
is in the ballistic or nearly-ballistic regime. However, especially when the
mean free path of the material under study is small, obtaining ballistic
contacts can ... | 2303.15968v2 |
2023-05-12 | Striation lines in intermittent fatigue crack growth in an Al alloy | Fatigue failure of crystalline materials is a difficult problem in science
and engineering, and recent results have shown that fatigue crack growth can
occur in intermittent jumps which have fat-tailed distributions. As fatigue
crack propagation is known to leave markings -- called striations -- on the
fracture surface... | 2305.07460v1 |
2023-07-07 | Observation of the anomalous Hall effect in a layered polar semiconductor | Progress in magnetoelectric materials is hindered by apparently contradictory
requirements for time-reversal symmetry broken and polar ferroelectric
electronic structure in common ferromagnets and antiferromagnets. Alternative
routes could be provided by recent discoveries of a time-reversal symmetry
breaking anomalous... | 2307.03541v1 |
2023-08-23 | Plastic deformation mechanisms during nanoindentation of W, Mo, V body-centered cubic single crystals and their corresponding W-Mo, W-V equiatomic random solid solutions | Deformation plasticity mechanisms in alloys and compounds may unveil the
material capacity towards optimal mechanical properties. We conduct a series of
molecular dynamics (MD) simulations to investigate plasticity mechanisms due to
nanoindentation in pure tungsten, molybdenum and vanadium body-centered cubic
single cr... | 2308.12206v1 |
2023-09-08 | Intralayer Negative Poisson's Ratio in Two-Dimensional Black Arsenic by Strain Engineering | Negative Poisson's ratio as the anomalous characteristic generally exists in
artificial architectures, such as re-entrant and honeycomb structures. The
structures with negative Poisson's ratio have attracted intensive attention due
to their unique auxetic effect and many promising applications in shear
resistant and en... | 2309.04058v1 |
2023-10-04 | Three-Sensor 2ω Method with Multi-directional Layout: A General Methodology for Measuring Thermal Conductivity of Solid Materials | Anisotropic thermal transport plays a key role in both theoretical study and
engineering practice of heat transfer, but accurately measuring anisotropic
thermal conductivity remains a significant challenge. To address this issue, we
propose the three-sensor 2{\omega} method in this study, which is capable of
accurately... | 2310.02846v1 |
2023-10-25 | Non-Destructive Imaging of Breakdown Process in Ferroelectric Capacitors Using \textit{In-situ} Laser-Based Photoemission Electron Microscopy | HfO$_2$-based ferroelectrics are one of the most actively developed
functional materials for memory devices. However, in HfO$_2$-based
ferroelectric devices, dielectric breakdown is a main failure mechanism during
repeated polarization switching. Elucidation of the breakdown process may
broaden the scope of application... | 2310.16275v1 |
2023-11-16 | Properties of Nb\_xTi\_{(1-x)}N thin films deposited on 300 mm silicon wafers for upscaling superconducting digital circuits | Scaling superconducting digital circuits requires fundamental changes in the
current material set and fabrication process. The transition to 300 mm wafers
and the implementation of advanced lithography are instrumental in facilitating
mature CMOS processes, ensuring uniformity, and optimizing the yield. This
study expl... | 2311.09772v2 |
2024-03-18 | Primary Defect Production in Doped Iron Grain Boundaries during Low Energy Collision Cascades | This study explores the intricate interactions between grain boundaries (GBs)
and irradiation-induced defects in nanocrystalline iron, highlighting the role
of dopants like copper. Utilizing molecular dynamics simulations, the research
delineates how GB properties, such as GB energy and defect formation energies,
influ... | 2403.12257v1 |
2024-05-21 | Engineering band structures of two-dimensional materials with remote moire ferroelectricity | The stacking order and twist angle provide abundant opportunities for
engineering band structures of two-dimensional materials, including the
formation of moire bands, flat bands, and topologically nontrivial bands. The
inversion symmetry breaking in rhombohedral-stacked transitional metal
dichalcogenides (TMDCs) endow... | 2405.12811v1 |
1996-07-08 | Dynamic Conductance in Quantum Hall Systems | In the framework of the edge-channel picture and the scattering approach to
conduction, we discuss the low frequency admittance of quantized Hall samples
up to second order in frequency. The first-order term gives the leading order
phase-shift between current and voltage and is associated with the displacement
current.... | 9607051v1 |
1997-02-12 | Kondo Effect in High-T_c Cuprates | We study the Kondo effect due to the nonmagnetic impurity, e.g., Zn, in
high-T_c cuprates based on the spin-change separated state. In the optimal or
overdoped case with the Kondo screening, the residual resistivity is dominated
by the spinons while the T-dependent part determined by the holons. This gives
$\rho(T) = {... | 9702103v2 |
1999-03-11 | Anisotropic States of Two-Dimensional Electron Systems in High Landau Levels: Effect of an In-Plane Magnetic Field | We report the observation of an acute sensitivity of the anisotropic
longitudinal resistivity of two-dimensional electron systems in half-filled
high Landau levels to the magnitude and orientation of an in-plane magnetic
field. In the third and higher Landau levels, at filling fractions nu=9/2,
11/2, etc., the in-plane... | 9903196v2 |
1999-06-23 | Micro-Raman and resistance measurements of epitaxial La0.7Sr0.3MnO3 films | The Channel-Spark method was used for deposition of highly oriented
ferromagnetic La0.7Sr0.3MnO3 films on NdGaO3 substrates. It was found that
additional oxygen decreases the film quality suppressing the Curie temperature
and metal-insulator transition below the room temperature. To achieve the best
quality of the film... | 9906348v1 |
1999-07-19 | Quantum Theory of Quantum-Hall Smectics | We propose a quantum stripe (smectic) coupled-Luttinger-liquid model for the
anisotropic states which occur in two-dimensional electron systems with
high-index partial Landau level filling, $\nu^{*} = \nu - \lbrack\nu\rbrack$.
Perturbative renormalization group calculations establish that interaction
terms neglected in... | 9907278v1 |
1999-10-14 | Electrical Noise From Phase Separation In Pr2/3Ca1/3MnO3 Single Crystal | Low frequency electrical noise measurements have been used to probe the
electronic state of the perovskite-type manganese oxide Pr2/3Ca1/3MnO3 versus
temperature and in the vicinity of the field-induced transition from the
insulating, charge-ordered state (I-CO) to the metallic, ferromagnetic state
(M-F). At high tempe... | 9910204v1 |
1999-12-20 | Oxygen isotope effects in high-quality thin films of manganites: Quantitative constraints on the physics of manganites | Oxygen isotope effects on the transport properties have been studied in
high-quality epitaxial thin films of La_{0.75}Ca_{0.25}MnO_{3} and
Nd_{0.7}Sr_{0.3}MnO_{3}. In the paramagnetic state, the resistivity can be well
fitted by \rho (T) = (A/\sqrt{T})\exp(E_{\rho}/k_{B}T) with the parameters A
and E_{a} depending stro... | 9912355v1 |
2000-05-03 | The doping dependence of T* - what is the real high-Tc phase diagram? | Underdoped high-Tc superconductors are frequently characterised by a
temperature, T*, below which the normal-state pseudogap opens. Two different
"phase diagrams" based on the doping (p) dependence of T* are currently
considered: one where T* falls to zero at a critical doping state and the other
where T* merges with T... | 0005063v2 |
2000-07-13 | Exclusion of quantum coherence as the origin of the 2D metallic state in high-mobility silicon inversion layers | The temperature and density dependence of the phase coherence time
$\tau_\phi$ in high-mobility silicon inversion layers was determined from the
magnetoresistivity due to weak localization. The upper temperature limit for
single-electron quantum interference effects was delineated by comparing
$\tau_\phi$ with the mome... | 0007230v3 |
2001-02-22 | Magnetoresistivity and Complete $H_{c2}(T)$ in $MgB_2$ | Detailed magneto-transport data on dense wires of $MgB_2$ are reported for
applied magnetic fields up to 18 T. The temperature and field dependencies of
the electrical resistivity are consistent with $MgB_2$ behaving like a simple
metal and following a generalized form of Kohler's rule. In addition, given the
generally... | 0102413v2 |
2001-08-17 | Entropy of vortex cores on the border of the superconductor-to-insulator transition in an underdoped cuprate | We present a study of Nernst effect in underdoped $La_{2-x}Sr_xCuO_4$ in
magnetic fields as high as 28T. At high fields, a sizeable Nernst signal was
found to persist in presence of a field-induced non-metallic resistivity. By
simultaneously measuring resistivity and the Nernst coefficient, we extract the
entropy of vo... | 0108277v2 |
2002-03-07 | Pseudogap and Conduction Dimensionalities in High-T_c Superconductors | The nature of normal state charge-carriers' dynamics and the transition in
conduction and gap dimensionalities between 2D and 3D for YBa_2 Cu_3
O_{7-delta} and Bi_2 Sr_2 Ca_{1-x} Y_x Cu_2 O_8 high-T_c superconductors were
described by computing and fitting the resistivity curves, rho(T,delta,x).
These were carried out ... | 0203164v8 |
2002-03-07 | The Onset of Anisotropic Transport of Two-Dimensional Electrons in High Landau Levels: An Isotropic-to-Nematic Liquid Crystal Phase Transition? | The recently discovered anisotropy of the longitudinal resistance of
two-dimensional electrons near half filling of high Landau levels is found to
persist to much higher temperatures T when a large in-plane magnetic field B||
is applied. Under these conditions we find that the longitudinal resistivity
scales quasi-line... | 0203174v1 |
2003-05-21 | Magnetoresistive response of a high mobility 2DES under electromagnetic wave excitation | Oscillations of the resistance observed under electromagnetic wave excitation
in the high mobility GaAs/AlGaAs 2DES are examined as a function of the
radiation frequency and the power, utilizing an empirical lineshape based on
exponentially damped sinusoids. The fit-analysis indicates the resistance
oscillation frequen... | 0305507v2 |
2003-07-15 | Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples | A novel low temperature bolometric method has been devised and implemented
for high-precision measurements of the microwave surface resistance of small
single-crystal platelet samples having very low absorption, as a continuous
function of frequency. The key to the success of this non-resonant method is
the in-situ use... | 0307340v1 |
2003-09-26 | Metastable Resistance Anisotropy Orientation of Two-Dimensional Electrons in High Landau Levels | In half-filled high Landau levels, two-dimensional electron systems possess
collective phases which exhibit a strongly anisotropic resistivity tensor. A
weak, but as yet unknown, rotational symmetry-breaking potential native to the
host semiconductor structure is necessary to orient these phases in macroscopic
samples.... | 0309625v2 |
2003-12-31 | Single-electron transistors in electromagnetic environments | The current-voltage (I-V) characteristics of single-electron transistors
(SETs) have been measured in various electromagnetic environments. Some SETs
were biased with one-dimensional arrays of dc superconducting quantum
interference devices (SQUIDs). The purpose was to provide the SETs with a
magnetic-field-tunable env... | 0312726v2 |
2004-08-19 | Charge dynamics of Ca_{2-x}Na_{x}CuO_{2}Cl_{2} as a correlated electron system with the ideal tetragonal lattice | We report the reflectivity and the resistivity measurement of
Ca_{2-x}Na_{x}CuO_{2}Cl_{2} (CNCOC), which has a single-CuO2-plane lattice with
no orthorhombic distortion. The doping dependence of the in-plane optical
conductivity spectra for CNCOC is qualitatively the same to those of other
cuprates, but a slight differ... | 0408423v1 |
2004-11-17 | Spin-fluctuation dominated electrical transport of Ni3Al at high pressure | We present the first study of a magnetic quantum phase transition in the
itinerant-electron ferromagnet Ni3Al at high pressures. Electrical resistivity
measurements in a diamond anvil cell at hydrostatic pressures up to 100 kbar
and temperatures as low as 50 mK indicate that the Curie temperature collapses
towards abso... | 0411451v1 |
2004-12-27 | Fiske steps studied with flux-flow resistance oscillation in a narrow stack of Bi2Sr2CaCu2O8+d junctions | We have experimentally investigated the fluxon dynamics in a narrow
Bi2Sr2CaCu2O8+d stack with junction length L~1.8 um. As an evidence of
high-frequency excitation by a collective cavity mode, under an (in-plane)
external magnetic field, the current-voltage characteristics show prominent
Fiske steps with the correspon... | 0412690v3 |
2005-03-07 | Quantum Hall Effect at 40 kelvin: Evidence of MacroscopicQuantization in the Extreme Soft Limit | Evidence of both fractional and integer quantum hall effects (QHE) in three
dimensional bulk replica opal (250nm diameter) structures of non-crystalline
carbon are presented. In a remarkably soft quantum limit of ~ 40K temperature
and about one tesla of magnetic field clear hall steps, such as n= 2/3, 4/5, 1
and others... | 0503166v1 |
2005-04-01 | On the origin of multiple ordered phases in PrFe4P12 | The nature of multiple electronic orders in skutterudite PrFe_4P_{12} is
discussed on the basis of a model with antiferro-quadrupole (AFQ) interaction
of \Gamma_3 symmetry. The high-field phase can be reproduced qualitatively
provided (i) ferro-type interactions are introduced between the dipoles as well
as between the... | 0504014v2 |
2005-04-27 | Influence of a Parallel Magnetic Field on Microwave Photoconductivity in a High-Mobility 2D Electron System | We have studied experimentally the influence of a parallel magnetic field
($B_{//}$) on microwave-induced resistance oscillations (MIRO) and
zero-resistance states (ZRS) previously discovered in a high-mobility 2D
electron system. We have observed a strong suppression of MIRO/ZRS by a modest
$B_{//}\sim 0.5$ T. In Hall... | 0504715v1 |
2005-05-25 | Anisotropy, disorder, and superconductivity in CeCu2Si2 under high pressure | Resistivity measurements were carried out up to 8 GPa on single crystal and
polycrystalline samples of CeCu2Si2 from differing sources in the homogeneity
range. The anisotropic response to current direction and small uniaxial
stresses was explored, taking advantage of the quasi-hydrostatic environment of
the Bridgman a... | 0505613v1 |
2005-07-06 | Magnetoresistance and spin polarization in the insulating regime of a Si two-dimensional electron system | We have studied the magnetoresistance in a high-mobility Si inversion layer
down to low electron concentrations at which the longitudinal resistivity
$\rho_{xx}$ has an activated temperature dependence. The angle of the magnetic
field was controlled so as to study the orbital effect proportional to the
perpendicular co... | 0507136v1 |
2006-05-22 | Radiation-induced magnetoresistance oscillations in two-dimensional electron systems under bichromatic irradiation | We analyze the magnetoresistance $R_{xx}$ oscillations in high-mobility
two-dimensional electron systems induced by the combined driving of two
radiation fields of frequency $\omega_1$ and $\omega_2$, based on the
balance-equation approach to magnetotransport for high-carrier-density systems
in Faraday geometry. It is ... | 0605521v1 |
2006-06-19 | Metallic State in Cubic FeGe beyond its Quantum Phase Transition | We report on results of electrical resistivity and structural investigations
on the cubic modification of FeGe under high pressure. The long-wavelength
helical order ($T_C=280$ K) is suppressed at a critical pressure $p_c\approx
19$ GPa. An anomaly in the resistivity data at $T_X(p)$ and strong deviations
from a Fermi-... | 0606493v1 |
2007-03-23 | Giant asymmetry of the longitudinal magnetoresistance in high-mobility two-dimensional electron gas on a cylindrical surface | A giant asymmetry in the magnetoresistance was revealed in high-mobility,
two-dimensional electron gas on a cylindrical surface. The longitudinal
resistance along the magnetic-field gradient impressed by the surface curvature
was found to vanish if measured along one of the edges of the curved Hall bar.
If the external... | 0703623v1 |
2006-12-17 | A New GEM-like Imaging Detector with Electrodes Coated with Resistive Layers | We have developed and tested several prototypes of GEM-like detectors with
electrodes coated with resistive layers: CuO or CrO. These detectors can
operate stably at gains close to 10E5 and they are very robust. We discovered
that the cathodes of these detectors could be coated by CsI layers and in such
a way the detec... | 0612166v1 |
1997-02-07 | The Landauer Resistance and Band Spectra for the Counting Quantum Turing Machine | The generalized counting quantum Turing machine (GCQTM) is a machine which,
for any N, enumerates the first $2^{N}$ integers in succession as binary
strings. The generalization consists of associating a potential with read-1
steps only. The Landauer Resistance (LR) and band spectra were determined for
the tight binding... | 9702021v1 |
2008-06-17 | Structural transition and anisotropic properties of single crystalline SrFe2As2 | Plate-like single crystals of SrFe2As2 as large as 3x3x0.5 mm3 have been
grown out of Sn flux. The SrFe2As2 single crystals show a structural phase
transition from a high temperature tetragonal phase to a low temperature
orthorhombic phase at To = 198 K, and do not show any sign of superconductivity
down to 1.8 K. The ... | 0806.2711v1 |
2008-08-29 | On collisions driven negative energy waves and Weibel instability of a relativistic electron beam in a quasi-neutral plasma | A new quasi-neutral model describing the Weibel instability of a high-current
relativistic beam propagating through a resistive plasma is developed. It
treats beam electrons as kinetic particles, and ambient plasma as a
non-relativistic fluid. For a finite-temperature beam, a new class of negative
energy magneto-sound ... | 0808.4078v2 |
2008-10-05 | Anisotropic magnetic and superconducting properties of pure and Co-doped CaFe$_2$As$_2$ single crystals | We report anisotropic dc magnetic susceptibility $\chi(T)$, electrical
resistivity $\rho(T)$, and heat capacity $C(T)$ measurements on the single
crystals of CaFe$_{2-x}$Co$_x$As$_2$ for $x$ = 0 and 0.06. Large sized single
crystals were grown by the high temperature solution method with Sn as the
solvent. For the pure... | 0810.0848v2 |
2008-11-17 | Possible superconductivity above 25 K in single crystalline Co-doped BaFe$_{2}$As$_{2}$ | We present superconducting properties of single crystalline
Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$ by measuring magnetization, resistivity,
upper critical field, Hall coefficient, and magneto-optical images. The
magnetization measurements reveal fish-tail hysteresis loop at high
temperatures and relatively high critica... | 0811.2621v1 |
2008-12-05 | High-T_c superconductivity induced by doping rare earth elements into CaFeAsF | We have successfully synthesized the fluoride-arsenide compounds
Ca$_{1-x}$RE$_x$FeAsF (RE=Nd, Pr; x=0, 0.6). The x-ray powder diffraction
confirmed that the main phases of our samples are Ca$_{1-x}$RE$_x$FeAsF with
the ZrCuSiAs structure. By measuring resistivity, superconductivity was
observed at 57.4 K in Nd-doped a... | 0812.1192v1 |
2009-01-14 | AC Josephson effect in the long voltage-biased SINIS junction | Theory of non-stationary coherent effects is developed for
superconductor-normal-superconductor (SNS) structures with relatively strong
normal scattering on S/N interfaces (interface resistance is large compared to
intrinsic resistance of N metal). Analitical expressions are found for the
time-dependent anomalous Green... | 0901.1966v2 |
2009-03-04 | Observation of a non-Ohmic Hall resistivity above the critical temperature in the high-temperature superconductor YBa$_{2}$Cu$_{3}$O$_{7-δ}$ | Investigations of the resistivity and the Hall effect as a function of
electric field and temperature in the normal state and upper part of the
superconducting transition of an optimally doped, very thin film of
YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ are reported. Using a fast pulsed-current
technique allowed to reduce the se... | 0903.0725v1 |
2009-04-17 | EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor | We report the ac magnetic susceptibility $\chi_{ac}$ and resistivity $\rho$
measurements of EuFe$_2$As$_2$ under high pressure $P$. By observing nearly
100% superconducting shielding and zero resistivity at $P$ = 28 kbar, we
establish that $P$-induced superconductivity occurs at $T_c \sim$~30 K in
EuFe$_2$As$_2$. $\rho... | 0904.2618v2 |
2009-06-29 | Spontaneous non-steady magnetic reconnection within the solar environment | This work presents a 2.5-dimensional simulation study of the instability of
current-sheets located in a medium with a strong density variation along the
current layer. The initial force-free configuration is observed to undergo a
two-stage evolution consisting of an abrupt regime transition from a slow to a
fast reconn... | 0906.5382v1 |
2009-07-17 | Performances of linseed oil-free bakelite RPC prototypes with cosmic ray muons | A comparative study has been performed on Resistive Plate Chambers (RPC) made
of two different grades of bakelite paper laminates, produced and commercially
available in India. The chambers, operated in the streamer mode using argon,
tetrafluroethane and isobutane in 34:59:7 mixing ratio, are tested for the
efficiency ... | 0907.2976v1 |
2009-10-21 | "Bad Metal" Conductivity of Hard Core Bosons | Two dimensional hard core bosons suffer strong scattering in the high
temperature resistive state at half filling. The dynamical conductivity is
calculated using non perturbative tools such as continued fractions, series
expansions and exact diagonalization. We find a large temperature range with
linearly increasing re... | 0910.4158v2 |
2009-12-16 | Distributed control of reactive power flow in a radial distribution circuit with high photovoltaic penetration | We show how distributed control of reactive power can serve to regulate
voltage and minimize resistive losses in a distribution circuit that includes a
significant level of photovoltaic (PV) generation. To demonstrate the
technique, we consider a radial distribution circuit with a single branch
consisting of sequential... | 0912.3281v1 |
2010-03-26 | Strong carrier-scattering in iron-pnictide superconductors with highest Tc obtained from charge transport experiments | Characteristic normal-state charge transport is found in the oxygen-deficient
iron-arsenides LnFeAsO1-y (Ln: La and Nd) with the highest Tc's among known
Fe-based superconductors. The effect of "doping" in this system is mainly on
the carrier scattering, quite distinct from that in high-Tc cuprates. In the
superconduct... | 1003.5039v1 |
2010-04-14 | Electron-hole coexistence in disordered graphene probed by high-field magneto-transport | We report on magneto-transport measurement in disordered graphene under
pulsed magnetic field of up to 57T. For large electron or hole doping, the
system displays the expected anomalous Integer Quantum Hall Effect (IQHE)
specific to graphene up to filling factor $\nu=2$. In the close vicinity of the
charge neutrality p... | 1004.2356v1 |
2010-05-30 | Loss-resistant state teleportation and entanglement swapping using a quantum-dot spin in an optical microcavity | We present a scheme for efficient state teleportation and entanglement
swapping using a single quantum-dot spin in an optical microcavity based on
giant circular birefringence. State teleportation or entanglement swapping is
heralded by the sequential detection of two photons, and is finished after the
spin measurement... | 1005.5545v2 |
2010-09-28 | Vortex Phase Diagram of Layered Superconductor Cu0.03TaS2 for H || c | The magnetization and anisotropic electrical transport properties have been
measured in high quality Cu0.03TaS2 single crystal. A pronounced peak effect
has been observed, indicating that the high quality and homogeneity are vital
to peak effect. A kink has been observed in the magnetic field H dependence of
the in-pla... | 1009.5449v2 |
2010-11-27 | Performance of Glass Resistive Plate Chambers for a high granularity semi-digital calorimeter | A new design of highly granular hadronic calorimeter using Glass Resistive
Plate Chambers (GRPCs) with embedded electronics has been proposed for the
future International Linear Collider (ILC) experiments. It features a 2-bit
threshold semi-digital read-out. Several GRPC prototypes with their electronics
have been succ... | 1011.5969v2 |
2010-12-13 | Self-consistent calculation of the single particle scattering rate in high $Tc$ cuprates | The linear temperature dependence of the resistivity above the optimal doping
is a longstanding problem in the field of high temperature superconductivity in
cuprates. In this paper, we investigate the effect of gauge fluctuations on the
momentum relaxation time and the transport scattering rate within the slave
boson ... | 1012.2764v1 |
2011-03-17 | Quantum-Classical Crossover and Apparent Metal-Insulator Transition in a Weakly Interacting 2D Fermi Liquid | We report the observation of a parallel magnetic field induced
metal-insulator transition (MIT) in a high-mobility two-dimensional electron
gas (2DEG) for which spin and localization physics most likely play no major
role. The high-mobility metallic phase at low field is consistent with the
established Fermi liquid tra... | 1103.3496v2 |
2011-05-05 | Pairing Fluctuations and Anomalous Transport Above the BCS-BEC Crossover in the Two Dimensional Attractive Hubbard Model | A Fermi liquid with weak attractive interaction undergoes a BCS transition to
a superconductor with reducing temperature. With increasing interaction
strength, the thermal transition is progressively modified as the high
temperature `metallic' phase develops a pseudogap due to pairing fluctuations
and the resistivity a... | 1105.1156v1 |
2011-11-28 | Evolution of a metastable phase with a magnetic phase coexistence phenomenon and its unusual sensitivity to magnetic field cycling in the alloys Tb5-xLuxSi3 (x <= 0.7) | Recently, we reported an anomalous enhancement of the positive
magnetoresistance beyond a critical magnetic field in Tb5Si3 in the
magnetically ordered state, attributable to 'inverse metamagnetism'. This
results in unusual magnetic hysteresis loops for the pressurized specimens,
which are relevant to the topic of 'ele... | 1111.6368v1 |
2012-10-09 | Interdependence of Electric Discharge and The Magnetorotational Instability in Protoplanetary Disks | We study how the magnetorotational instability (MRI) in protoplanetary disks
is affected by the electric discharge caused by the electric field in the
resistive MHD. We have performed three-dimensional shearing box simulations
with various values of plasma beta and electrical breakdown models. We find the
self-sustainm... | 1210.2508v2 |
2012-12-18 | Microwave properties of superconducting atomic-layer deposited TiN films | We have grown superconducting TiN films by atomic layer deposition with
thicknesses ranging from 6 to 89 nm. This deposition method allows us to tune
the resistivity and critical temperature by controlling the film thickness. The
microwave properties are measured, using a coplanar-waveguide resonator, and we
find inter... | 1212.4434v1 |
2013-04-22 | Persistent non-metallic behavior in Sr2IrO4 and Sr3Ir2O7 at high pressures | Iridium-based 5d transition-metal oxides are attractive candidates for the
study of correlated electronic states due to the interplay of enhanced
crystal-field, Coulomb and spin-orbit interaction energies. At ambient
pressure, these conditions promote a novel Jeff = 1/2 Mott insulating state,
characterized by a gap of ... | 1304.5864v2 |
2013-08-28 | Normal-state charge dynamics in doped BaFe2As2: Roles of doping and necessary ingredients for superconductivity | We carried out a comparative study of the in-plane resistivity and optical
spectrum of doped BaFe2As2 and investigated the doping evolution of the charge
dynamics. For BaFe2As2, charge dynamics is incoherent at high temperatures.
Electron (Co) and isovalent (P) doping into BaFe2As2 increase coherence of the
system and ... | 1308.6133v1 |
2014-04-07 | Crystal structure and physical properties of EuPtIn$_{4}$ intermetallic antiferromagnet | We report the synthesis of EuPtIn$_{4}$ single crystalline platelets by the
In-flux technique. This compound crystallizes in the orthorhombic Cmcm
structure with lattice parameters $a=4.542(1)$ \AA, $b=16.955(2)$ \AA$\,$ and
$c=7.389(1)$ \AA. Measurements of magnetic susceptibility, heat capacity,
electrical resistivit... | 1404.1660v1 |
2014-04-14 | High temperature superconducting FeSe films on SrTiO3 substrates | Interface enhanced superconductivity at two dimensional limit has become one
of most intriguing research directions in condensed matter physics. Here, we
report the superconducting properties of ultra-thin FeSe films with the
thickness of one unit cell (1-UC) grown on conductive and insulating SrTiO3
(STO) substrates. ... | 1404.3464v2 |
2014-04-16 | Magnetic Ordering at Anomalously High Temperatures in Dy at Extreme Pressures: a New Kondo-Lattice State? | In an attempt to destabilize the magnetic state of the heavy lanthanides Dy
and Gd, extreme pressures were applied in an electrical resistivity measurement
to 157 GPa over the temperature range 5 - 295 K. The magnetic ordering
temperature $T_{\text{o}}$ and spin-disorder resistance $R_{sd}$ of Dy, as well
as the superc... | 1404.4256v3 |
2014-05-14 | Theory of universal incoherent metallic transport | In an incoherent metal, transport is controlled by the collective diffusion
of energy and charge rather than by quasiparticle or momentum relaxation. We
explore the possibility of a universal bound $D \gtrsim \hbar v_F^2/(k_B T)$ on
the underlying diffusion constants in an incoherent metal. Such a bound is
loosely moti... | 1405.3651v3 |
2014-05-14 | Linear Resistivity from Non-Abelian Black Holes | Starting with the holographic p-wave superconductor, we show how to obtain a
finite DC conductivity through a non-abelian gauge transformation. The
translational symmetry is preserved. We obtain phenomenological similarities
with high temperature cuprate superconductors. Our results suggest that a
lattice or impurities... | 1405.3714v4 |
2014-06-10 | Nonlinear transport and noise thermometry in quasi-classical ballistic point contacts | We study nonlinear transport and non-equilibrium current noise in
quasi-classical point contacts (PCs) defined in a low-density high-quality
two-dimensional electron system in GaAs. At not too high bias voltages $V$
across the PC the noise temperature is determined by a Joule heat power and
almost independent on the PC... | 1406.2481v2 |
2014-12-11 | Transition-Metal Substitutions in Iron Chalcogenides | The $ab$-plane resistivity and Hall effect are studied in
Fe$_{1-y}$M$_y$Te$_{0.65}$Se$_{0.35}$ single crystals doped with two transition
metal elements, M = Co or Ni, over a wide doping range, $0 \leq y \leq 0.2$.
The superconducting transition temperature, $T_{c}$, reaches zero for Co at $y
\simeq 0.14$ and for Ni at... | 1412.3599v1 |
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