FieldsElectron states in condensed matter

Pressure-Tuned Classical–Quantum Crossover in Magnetic Field-Induced Quantum Phase Transitions of a Triangular-Lattice Antiferromagnet

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.

Magnetic properties in condensed matter

Electron states in condensed matter

Cross-disciplinary physics and related areas of science and technology

d² Trimer and d³ Tetramer in a Pyrochlore Lattice

Based on the charge disproportionation of V³⁺ and V²⁺, the V³⁺(d²) trimers and V²⁺(d³) tetramers in the vanadium pyrochlore lattice of AlV₂O₄ are described by the orbitally-induced 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 First-Principles Calculations

Using first-principles 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

A new superconductor family, Sc₆MTe₂, 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.

Superconductivity

Cross-disciplinary physics and related areas of science and technology

Electron states in condensed matter

Dzyaloshinskii–Moriya Interactions in Magnetism, Electricity, and Electronics

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.

Magnetic properties in condensed matter

Electron states in condensed matter

Dielectric, optical, and other properties in condensed matter

Self-Energy Singularity Explains High-Temperature Superconductivity in Cuprates

A new review discusses the high-temperature superconductivity mechanisms in copper oxides, explaining the various phases observed in these materials based on a nonperturbative effect called self-energy singularity.

Superconductivity

Electron states in condensed matter

Towards a New Phase in Materials Science with Hyperordered Structures

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.

Structure and mechanical and thermal properties in condensed matter

Cross-disciplinary physics and related areas of science and technology

Dielectric, optical, and other properties in condensed matter

Electron states in condensed matter

Atomic and molecular physics

Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

High Magnetic Field as a Tool for Discovery in Condensed Matter Physics

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

Observing the de Haas–van Alphen Effect to Unveil the Electronic Structure of UTe₂ Superconductor

The topology of Fermi surfaces with heavy effective masses in strongly correlated topological superconductor UTe₂ was investigated using quantum oscillation measurements and theoretical calculations.

Electron states in condensed matter

Superconductivity

Can a Node-Less Wave Function Have Higher Energy than Node-Full Ones?

“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 large-scale DFT (density-functional theory) calculations performed for the decavacancy in Si crystal.

Electron states in condensed matter

Structure and mechanical and thermal properties in condensed matter

Phosphorous-Based Zintl Compounds as Viable Semimetals

A black-phosphorus-derived Zintl compound, MoP₄, is obtained by high-pressure synthesis. The material exhibits a non-quadratic large magnetoresistance and semi-metallic Seebeck behavior, as predicted by the first principles calculations yielding massive and non-symmorphic 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

Materials with Dirac Loops: A Potential Solution for Next-generation Electronics

A high-quality 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

Non-real Energies with Real Effects in Exotic Condensed Matter Systems

Scientists demonstrate the presence of non-Hermitian topological properties preserved under continuous physical deformations in strongly correlated systems in equilibrium, resulting from short-lived quanta of collective excitations.

Electron states in condensed matter

A Quantum Description of Physical Systems with Non-real Energies

While quantum systems are traditionally described by Hermitian Hamiltonians, the formalism is extendable to a non-Hermitian description for systems that are dissipative or obey parity-time symmetry.

Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

Nuclear physics

Electron states in condensed matter

Gases, plasmas, electric discharges, accelerators, and beams

Uncovering the Superlattice Structure of Calcium Iridium Oxide at Phase Transition

Order parameter of non-magnetic phase transition at 105 K, which is called "hidden order", was revealed in spin-orbit coupled iridate Ca₅Ir₃O₁₂. 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 cross-correlated response.

Electron states in condensed matter

Structure and mechanical and thermal properties in condensed matter

Overlooked Materials Host Rich Physics of Strongly Correlated Electrons

An international team of researchers reviews the research progress on strongly spin-orbit 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

No Mass Gap Phase Transition in Novel Massless Dirac Fermion Material

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