FieldsElectronic transport in condensed matter

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Exploring Electronic States in BEDTTTF Organic Superconductors
2024424
This review, published in the Journal of the Physical Society of Japan, provides a comprehensive summary of the electronic states observed in BEDTTTF type organic superconductors, including metalinsulator transitions, Mottness transitions, nonFermi liquids, quantum spin liquids, and BoseEinstein condensation.
Superconductivity
Electronic transport in condensed matter
Magnetic properties in condensed matter

Conversion of Chiral Phonons into Magnons in Magnets
202441
A new phenomenon involving the conversion of chiral phonons into magnons is theoretically predicted. The effective magnetic field induced by chiral phonons causes a change in the spin magnetization of magnets.
Electronic transport in condensed matter

Variety of Mechanically Induced Spin Currents in Rashba Systems
2024322
Various types of spin currents, including unconventional types, are generated in Rashba spinorbit coupled systems by dynamic lattice distortions associated with, for example, surface acoustic waves.
Electronic transport in condensed matter
Magnetic properties in condensed matter
Structure and mechanical and thermal properties in condensed matter

What Determines the Sign of Spin Current? ~ Theoretical Study of Spin Seebeck Effect in Antiferromagnetic Insulators
2024318
We developed a microscopic theory for the spin Seebeck effect in antiferromagnets, that explains the sign reversal of the spin current at the spinflop transition point and describes the sorts of dominant carriers.
Electronic transport in condensed matter

Chiral Anomalies in Organic Dirac Semimetals
202425
A threedimensional massless Dirac fermion system exhibiting broken chiral symmetry was successfully realized in organic conductor α(BEDTTTF)_{2}I_{3} under high pressures. Our study detected the chiral anomalyinduced negative magnetoresistance and planar Hall effects and opened new avenues for further advancements in the field.
Electronic transport in condensed matter

Thermodynamic Property of a CMOS Device beyond Landauer Limit
2024123
Focusing on a CMOS NAND GATE operating in a subthreshold region, the thermodynamic cost of computation was analyzed in relation to input/output voltages surpassing the Landauer limit.
Statistical physics and thermodynamics
Electronic transport in condensed matter
Crossdisciplinary physics and related areas of science and technology

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GeometryBased Nonlinear and Nonequilibrium Phenomena in Solids
2023710
Researchers from The University of Tokyo have recently reviewed geometric aspects of nonlinear and nonequilibrium optical phenomena for advanced materials applications in novel solar panels, photodetectors, diodes, and quantum computing.
Electronic structure and electrical properties of surfaces and nanostructures
Dielectric, optical, and other properties in condensed matter
Electronic transport in condensed matter

Quantum Hall Effect in Bulk (Multilayered) Organic Crystal
202366
The multilayer quantum Hall effect is discovered in an organic massless Dirac electron system, α(BETS)_{2}I_{3} under pressure at low temperatures and a magnetic field of approximately 1 T.
Electronic structure and electrical properties of surfaces and nanostructures
Electronic transport in condensed matter

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High Magnetic Field as a Tool for Discovery in Condensed Matter Physics
20221213
The Journal of the Physical Society of Japan highlights in this special topic recent advances in modern physics that have been realized with the generation of pulsed high magnetic fields.
Magnetic properties in condensed matter
Dielectric, optical, and other properties in condensed matter
Electronic transport in condensed matter
Structure and mechanical and thermal properties in condensed matter
Electron states in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures
Measurement, instrumentation, and techniques

Strange Metal Behavior Potentially Associated to Hidden Electronic Nematicity
20221110
Ironbased superconductor, Ba_{1x}Rb_{x}Fe_{2}As_{2}, exhibits “strange metal” behavior—linear dependence of resistivity on temperature. It seems that hidden electronic nematic fluctuations play a greater role than the wellknown antiferromagnetic fluctuations.
Superconductivity
Electronic transport in condensed matter

Thermoelectric Response in Strongly Disordered Systems
2022117
Based on the Kubo–Luttinger linear response theory, we discovered that the lowT Seebeck coefficient for Mott variablerange hopping in a ddimensional system varies as S ∝ T^{d}^{/(d+1)}, which is different from the conventional S ∝ T^{(}^{d}^{−1)/(}^{d}^{+1)}. In addition, the experimental data for S of CuCrTiS_{4} at low T are in excellent agreement with our prediction S ∝ T^{3/4} (d = 3).
Electronic transport in condensed matter

Spin Transport in a TwoDimensional Tilted Dirac Electron System
2022413
We propose that spin current in an organic conductor, α(BETS)_{2}I_{3}, is an appropriate physical quantity to detect the topological nature of the material whose electrons obey a quasitwodimensional Dirac equation.
Electronic transport in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures

Violation of FluctuationDissipation Theorem Results in Robustness of Fluctuation Against Localization
2022323
We study equilibrium current fluctuations in systems without timereversal symmetry, violating the fluctuationdissipation theorem. Notably, the offdiagonal fluctuation is insensitive to system imperfections in contrast to other fluctuations and conductivity.
Statistical physics and thermodynamics
Electronic transport in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures

Topological Aspects of a Nonlinear System: The Dimerized Toda Lattice
2022316
A nonlinear topological phase is shown to emerge in the dimerized Toda lattice. It is experimentally detectable by measuring the voltage propagation in electric circuits.
Electronic structure and electrical properties of surfaces and nanostructures
Electronic transport in condensed matter

Unusual Nonlinear Conductivity in ChargeOrdered α(BEDTTTF)_{2}I_{3}
202239
Unusual nonlinear conduction is detected in organic molecular salt α(BEDTTTF)_{2}I_{3}. The observed thirdorder nonlinear conductivity implies a quadrupole instability hidden in this chargeordered organic salt.
Electronic transport in condensed matter

New Systematic Analysis Method of Identifying Microscopic Essential Couplings
2022131
We propose a systematic method of identifying essential model parameters for nonlinear response tensors. The analysis results reveal fundamental couplings in nontrivial responses and promote further development of multiferroic responses.
Electronic transport in condensed matter
Dielectric, optical, and other properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

Twist in the Tale: Exploring the Dielectric Screening Effect in Twisted Bilayer Graphene
2022112
Although the screening of an external electric field, strongly influences the electronic states of twodimensional material stack, it is not well understood. Magnetotransport measurements of twisted double bilayer graphene uncovered the screening of atomic layers.
Electronic structure and electrical properties of surfaces and nanostructures
Electronic transport in condensed matter

SpinWave Dynamics in Antiferromagnets under Electric Current
20211228
Electric current causes a Doppler effect in spin waves in ferromagnets through a spintransfer torque. We report that antiferromagnets allow two such spintransfer torques and present a microscopic analysis that interpolates ferro and antiferromagnetic transport regimes.
Electronic transport in condensed matter
Magnetic properties in condensed matter

Materials with Dirac Loops: A Potential Solution for Nextgeneration Electronics
20211014
A highquality single crystal of rhenium oxide shows significantly large magnetoresistance, potentially originating from a unique electronic structure called “hourglass Dirac chain” protected by the symmetry of the crystal.
Electronic transport in condensed matter
Electron states in condensed matter

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Measurements and Implications of Shot Noise in Mesoscopic Systems
2021929
Shot noise measurements provide rewarding insights into system properties, nonequilibrium phenomena, and quantum effects in mesoscopic systems.
Electronic transport in condensed matter
Magnetic properties in condensed matter
Superconductivity

Exploring the Thermoelectric Properties of Nitrogendoped Carbon Nanotubes
2021929
A semiconducting carbon nanotube doped with an optimal concentration of nitrogen delivered a thermoelectric power substantially higher than that delivered by commercial Bi_{2}Te_{3} alloys.
Electronic transport in condensed matter
Structure and mechanical and thermal properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

Finding Pattern in Randomness: Brownian Motion of Skyrmions
202197
The chiral properties of the Brownian motion of magnetic skyrmions in one and twodimensional systems in thermal equilibrium are reported.
Structure and mechanical and thermal properties in condensed matter
Electronic transport in condensed matter
Magnetic properties in condensed matter

Nonlinear Thermoelectric Transport Will Open a New and Exotic Way to Detect Topological Nature of Dirac Electrons in Solids
2021825
Recently, it was proposed that a novel nonlinear anomalous Ettingshausen effect enabled a new and exotic approach to observe topological nature of Dirac electrons in solids using thermoelectric properties.
Electronic transport in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures
Structure and mechanical and thermal properties in condensed matter

Semiconductor to Semimetal to Superconductor: An Excitonic Journey
2021816
A phase diagram was constructed for Ta_{2}NiSe_{5}, a promising candidate for excitonic insulators, using high pressure as a tuning parameter. The results indicated pressureinduced superconductivity in the semimetallic phase.
Superconductivity
Electronic transport in condensed matter

Exploring the Physics of Ferrimagnets for Future Spintronics Applications
202186
This Special Topics collection of the Journal of the Physical Society of Japan covers recent progress in spintronics research on ferrimagnetic materials.
Structure and mechanical and thermal properties in condensed matter
Electronic transport in condensed matter
Magnetic properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

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Overlooked Materials Host Rich Physics of Strongly Correlated Electrons
202172
An international team of researchers reviews the research progress on strongly spinorbit coupled systems, providing an overview of theoretically predicted electronic phases, candidate materials, and unusual experimental observations.
Electron states in condensed matter
Magnetic properties in condensed matter
Electronic transport in condensed matter

How a Potentially Novel Effect Converts AC Current into DC Heat Flow
2021524
A novel currentinduced thermoelectric phenomenon, the nonlinear anomalous Ettingshausen effect, was discussed. As an example, the weak charge ordering state in an organic conductor α(BEDTTTF)_{2}I_{3} was focused on. This effect generates a transverse heat current with rectifying characteristics, namely unidirectionality even under AC fields.
Electronic transport in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures
Structure and mechanical and thermal properties in condensed matter

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Random Numbers Can Help Solve Difficult Problems in Manybody Physics
2021329
Theorists review a random state vectorbased description of quantum manybody systems which helps greatly reduce the computational burden involved in their numerical simulations, opening doors to applications in quantum computing.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Electronic transport in condensed matter
Magnetic properties in condensed matter

No Mass Gap Phase Transition in Novel Massless Dirac Fermion Material
2021322
Using an organic massless Dirac fermion system, we found that massless Dirac fermions undergo a quantum phase transition without creating any mass gap even in the strong coupling regime.
Electron states in condensed matter
Electronic transport in condensed matter

What Dictates Nonlinear Behavior in Strongly Correlated Insulators?
202133
The nonlinear conduction (the deviation from Ohm's law) has been discovered universally in various correlated materials. This may be explained by the percolation conduction in disordered materials.
Electronic transport in condensed matter
Statistical physics and thermodynamics