FieldsElectron states in condensed matter

NEWFermi Machine — Quantum ManyBody Solver Derived from Mapping between Noninteracting and Strongly Correlated Fermions
20241029
Strongly interacting quantum manybody states can be mapped to noninteracting quantum states, enabling a new quantum neural network called the Fermi machine to solve strongly correlated electron problems.Electron states in condensed matter
Measurement, instrumentation, and techniques

PressureTuned Classical–Quantum Crossover in Magnetic FieldInduced Quantum Phase Transitions of a TriangularLattice Antiferromagnet
202495
The correspondence principle states that as quantum numbers approach infinity, the nature of a system described by quantum mechanics should match that described by classical mechanics. Quantum phenomena, such as quantum superposition and quantum correlation, generally become unobservable when a system approaches this regime. Conversely, as quantum numbers decrease, classical descriptions give way to observable quantum effects. The external approach to classical–quantum crossover has attracted research interest. This study aims to demonstrate a method for achieving such control in materials.
Crossdisciplinary physics and related areas of science and technology
Electron states in condensed matter
Magnetic properties in condensed matter

d^{2} Trimer and d^{3} Tetramer in a Pyrochlore Lattice
2024711
Based on the charge disproportionation of V^{3+} and V^{2+}, the V^{3+}(d^{2}) trimers and V^{2+}(d^{3}) tetramers in the vanadium pyrochlore lattice of AlV_{2}O_{4} are described by the orbitallyinduced Peierls mechanism.
Dielectric, optical, and other properties in condensed matter
Electron states in condensed matter

Evaluation of the Exchange Stiffness Constants of Itinerant Magnets from the FirstPrinciples Calculations
202465
Using firstprinciples calculations, we evaluated the exchange stiffness constants of ferromagnetic metals at finite temperatures. The constants can be used as parameters in the Landau–Lifshitz–Gilbert equation.
Electron states in condensed matter
Structure and mechanical and thermal properties in condensed matter

A New Superconductor Family with Various Magnetic Elements
20231027
A new superconductor family, Sc_{6}MTe_{2}, has been discovered, comprising seven variations with magnetic elements labeled as M. Notably, only a few known superconductor families exist that involve various magnetic elements.
Crossdisciplinary physics and related areas of science and technology
Electron states in condensed matter
Superconductivity

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Dzyaloshinskii–Moriya Interactions in Magnetism, Electricity, and Electronics
20231012
A collection of papers in the Journal of the Physical Society of Japan advances our understanding of Dzyaloshinskii–Moriya interaction and paves the way for developing next generation computing and electronic systems.
Dielectric, optical, and other properties in condensed matter
Electron states in condensed matter
Magnetic properties in condensed matter

PICKUPSelfEnergy Singularity Explains HighTemperature Superconductivity in Cuprates
2023718
A new review discusses the hightemperature superconductivity mechanisms in copper oxides, explaining the various phases observed in these materials based on a nonperturbative effect called selfenergy singularity.
Electron states in condensed matter
Superconductivity

PICKUPTowards a New Phase in Materials Science with Hyperordered Structures
202351
A Special Topics edition of the Journal of the Physical Society of Japan features articles discussing recent advancements in hyperordered structures in materials, their applications, and the techniques for observing them.
Atomic and molecular physics
Crossdisciplinary physics and related areas of science and technology
Dielectric, optical, and other properties in condensed matter
Electron states in condensed matter
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Structure and mechanical and thermal properties in condensed matter

PICKUPHigh 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.
Dielectric, optical, and other properties in condensed matter
Electron states in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures
Electronic transport in condensed matter
Magnetic properties in condensed matter
Measurement, instrumentation, and techniques
Structure and mechanical and thermal properties in condensed matter

Observing the de Haas–van Alphen Effect to Unveil the Electronic Structure of UTe_{2} Superconductor
20221116
The topology of Fermi surfaces with heavy effective masses in strongly correlated topological superconductor UTe_{2 }was investigated using quantum oscillation measurements and theoretical calculations.
Electron states in condensed matter
Superconductivity

Can a NodeLess Wave Function Have Higher Energy than NodeFull Ones?
202296
“The energy level of an electron state increases as the number of nodes in its wave function increases.” The preceding statement, often found in textbooks, was challenged by our largescale DFT (densityfunctional theory) calculations performed for the decavacancy in Si crystal.
Electron states in condensed matter
Structure and mechanical and thermal properties 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.
Electron states in condensed matter
Electronic structure and electrical properties of surfaces and nanostructures
Structure and mechanical and thermal 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.
Electron states in condensed matter
Electronic transport in condensed matter

PTEP SPECIAL SECTIONNonreal Energies with Real Effects in Exotic Condensed Matter Systems
2021719
Scientists demonstrate the presence of nonHermitian topological properties preserved under continuous physical deformations in strongly correlated systems in equilibrium, resulting from shortlived quanta of collective excitations.Electron states in condensed matter

PTEP SPECIAL SECTIONA Quantum Description of Physical Systems with Nonreal Energies
2021719
While quantum systems are traditionally described by Hermitian Hamiltonians, the formalism is extendable to a nonHermitian description for systems that are dissipative or obey paritytime symmetry.Electron states in condensed matter
Gases, plasmas, electric discharges, accelerators, and beams
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Nuclear physics

Uncovering the Superlattice Structure of Calcium Iridium Oxide at Phase Transition
202179
Order parameter of nonmagnetic phase transition at 105 K, which is called "hidden order", was revealed in spinorbit coupled iridate Ca_{5}Ir_{3}O_{12}. This discover of order parameter with rotational and directional degrees of freedom in atomic scale will lead to development of energy saving devices with a fast crosscorrelated response.Electron states in condensed matter
Structure and mechanical and thermal properties in condensed matter

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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
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