FieldsElectronic structure and electrical properties of surfaces and nanostructures

How Many Excitons Can Combine?
2023831
Quantum diffusion Monte Carlo simulation demonstrated the formation of polyexcitons in twodimensional multivalley semiconductor systems, where all exciton pairs were energetically bound by equalstrength “chemical bonds.”
Dielectric, optical, and other properties in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures

Topological Properties of the Periodic Toda Lattice: Analogy with the Thouless Pump
202388
We find that the periodic Toda lattice belongs to the same topological class as the Thouless pump.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Electronic structure and electrical properties of surfaces and nanostructures

Double Superconductivity in Nodal Line Material NaAlSi; Coexistence of Bulk and 2D Superconductivities
2023726
Unique diamagnetic torque signals are found in the nodal line material NaAlSi, which suggests the presence of double superconductivity; i.e., bulk superconductivity and 2D superconductivity on the crystal surface.
Superconductivity
Electronic structure and electrical properties of surfaces and nanostructures

PICKUP
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

ElectronHole Asymmetry Observed in Photoinduced Phase Transition of Excitonic Insulators
2023614
During a photoinduced phase transition from an excitonic insulator to a semimetal, photoinduced energy shift of its hole band is delayed than that of its electron band indicating electronhole asymmetry.
Dielectric, optical, and other properties in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures

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

AngleResolved Photoelectron Spectroscopy Microscopy: A Tool to Accelerate Nanomaterials Research
2023210
Researchers have published a practical guide on new uses of photoelectron microscopy combined with valence band dispersion analysis. They visualized severalmicrometerswide graphite facets and precisely characterized the band structure.
Electronic structure and electrical properties of surfaces and nanostructures
Structure and mechanical and thermal properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

PICKUP
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

SpinOrbit Coupled Electrons on Kagome Lattice Give Rise to Various Magnetic Orderings
2022810
Diverse magnetic orderings are found to be produced by spinorbit coupled electrons on the kagome lattice. This finding provides a unified guiding principle for the design of magnetic topological materials.
Electronic structure and electrical properties of surfaces and nanostructures

A New Route to the Realization of Topological Superconductivity
202281
We theoretically suggest that topological Weyl superconductivity can be realized by applying a supercurrent to noncentrosymmetric linenodal superconductors with spin–orbit coupling.
Superconductivity
Electronic structure and electrical properties of surfaces and nanostructures

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

PhosphorousBased Zintl Compounds as Viable Semimetals
202224
A blackphosphorusderived Zintl compound, MoP_{4}, is obtained by highpressure synthesis. The material exhibits a nonquadratic large magnetoresistance and semimetallic Seebeck behavior, as predicted by the first principles calculations yielding massive and nonsymmorphic Dirac semimetal states.
Electronic structure and electrical properties of surfaces and nanostructures
Structure and mechanical and thermal properties in condensed matter
Electron states in condensed matter

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

Analyzing Photoinduced Phase Transitions in an Organic Salt Using Floquet Theory
2021115
Rich nonequilibrium phase diagrams, including photoinduced topological insulator phases, were theoretically predicted for an organic salt α(BEDTTTF)_{2}I_{3} when irradiated by elliptically polarized light.
Electronic structure and electrical properties of surfaces and nanostructures
Dielectric, optical, and other properties in condensed matter

Electronic Structure Transformation in a Magnetized Topological Semimetal
2021106
We theoretically show that the nodal structures in topological semimetals, including Weyl points and nodal lines, can be switched by magnetic orders, accompanied by localized states at magnetic domain walls.
Electronic structure and electrical properties of surfaces and nanostructures

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

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

Magnetic Responses of Majorana Kramers Pairs on TimeReversal Invariant Topological Superconductors
202133
We reveal magnetic degrees of freedom of Majorana fermions and find a new type of response that are distinct from those of conventional electrons.
Superconductivity
Electronic structure and electrical properties of surfaces and nanostructures