Year2023

Possible Origin of High Thermoelectric Power Factor in Ultrathin FeSe: A Two-band Model

The high thermoelectric power factor observed in ultrathin FeSe can be theoretically explained by a two-band model with chemical potential between upper and lower band bottoms.

Electronic structure and electrical properties of surfaces and nanostructures

Structure and mechanical and thermal properties in condensed matter

Cross-disciplinary physics and related areas of science and technology

Quantum Dripping of Superfluid ⁴He

Superfluid ⁴He droplets exhibit robustly quantized dripping periods despite gradually varying input flow rates owing to their high amplitude and undamped oscillation.

One-Way Optical Waveguide Realized by Edge Modes of Topological Photonic Crystals

A one-way optical waveguide was realized on the boundary between two types of photonic crystals with different topological properties, which were demonstrated by high-resolution infrared reflection measurements.

Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics

Dielectric, optical, and other properties in condensed matter

Exploring Recent Advances in the Physics of Biofluid Locomotion

This Special Topics Edition of the JPSJ describes the latest advances in the field of biofluid locomotion, shedding light on the underlying physics behind the movement of organisms that swim and fly.

Measurement, instrumentation, and techniques

Cross-disciplinary physics and related areas of science and technology

Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics

Statistical physics and thermodynamics

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

Structure and mechanical and thermal properties in condensed matter

Magnetic Excitation in S = 1/2 Antiferromagnetic Chain CsCoCl₃ with Ising-Like Exchange Interaction

The results of high-field electron spin resonance measurements in the millimeter-wave to terahertz region reveal unconventional magnetic excitation in S = 1/2 one-dimensional antiferromagnets.

Magnetic properties in condensed matter

Highly Accurate Estimation of Beta Decay Rates for Heavy Nuclei

Physicists from Japan present complete formulas that consider the induced current and velocity-dependent terms for estimating the beta decay rates in heavy nuclei with high accuracy.

Nuclear physics

Strange Elastic Anomalies with Ultraslow Dynamics around Magnetic Critical Endpoint

Near the magnetic critical endpoint of UCoAl, peculiar elastic anomalies exhibiting exotic ultraslow dynamics arising from electric quadrupoles are indicated. Combining this with diverse fluctuations, intriguing phenomena and exotic ground states are expected.

Structure and mechanical and thermal properties in condensed matter

Magnetic 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

Discovering a Local Fluctuation Theorem with Machine Learning

A groundbreaking study reveals a new time-local fluctuation theorem using machine learning, revolutionizing our understanding of deterministic nonequilibrium steady state systems.

Fundamental Theory of Condensed Matter Physics, Statistical Mechanics, Fluid Dynamics,

Statistical physics and thermodynamics

Measurement, instrumentation, and techniques

Study of Unconventional Slow Critical Dynamics of the Frustrated Magnet DyRu₂Si₂ ~Spontaneous Alignment of Emergent Ferromagnetic Spin Textures?~

We measured the ac susceptibility of the frustrated magnet DyRu₂Si₂, in the partially ordered phase, where emergent 2-dimensional (2-D) disordered planes appear, and revealed extraordinarily slow and unconventional dynamics, which could be attributed to the highly fluctuating nature of the emergent 2-D planes.

Magnetic properties 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

Going Beyond Einstein with Modified Theories of Gravity

This study comprehends a way to probe modified theories of gravity on cosmological scales by combining theoretical advancements and observational data for upcoming cosmological observations.

Astrophysics, cosmology, and geophysics

Antisymmetric Exchange Interaction Selects the Cycloidal Helicity: Observation by Resonant X-ray Diffraction

The unique sense of rotation of the cycloidal magnetic order was clarified in noncentrosymmetric EuIrGe₃ by using circularly polarized resonant x-ray diffraction.

Magnetic properties in condensed matter

How Many Excitons Can Combine?

Quantum diffusion Monte Carlo simulation demonstrated the formation of polyexcitons in two-dimensional multi-valley semiconductor systems, where all exciton pairs were energetically bound by equal-strength “chemical bonds.”

Dielectric, optical, and other properties in condensed matter

Electronic structure and electrical properties of surfaces and nanostructures

Exploring Vortex Dynamics in a Multi-band Superconductor

We measured the microwave flux-flow Hall effect in FeSe, where the cancellation of holes and electrons was observed. This is a novel effect of multi-band superconductors.

Superconductivity

Toward Accurate Diamond Quantum Sensing

A systematic investigation of the optical power dependence of the response of diamond quantum sensors provides valuable guidelines for accurate magnetic field measurements.

Dielectric, optical, and other properties in condensed matter

Topological Properties of the Periodic Toda Lattice: Analogy with the Thouless Pump

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

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

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

Investigating Δ and Ω Baryons as Meson–Baryon Bound States in Lattice Quantum Chromodynamics

We investigate Δ and Ω baryons as meson–baryon bound states in lattice quantum chromodynamics and show that their difference results from the kinematic structure of the two meson–baryon systems, and not their interaction.

Theoretical Particle Physics

Geometry-Based Nonlinear and Nonequilibrium Phenomena in Solids

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

Ultra Purification Unveils the Intrinsic Nature in Spin-Triplet Superconductor UTe₂

Microscopic spin-susceptibility measurements in ultra-pure UTe₂ samples reveal that superconducting symmetry is analogous to the superfluidity of the ³He B-phase and that U deficiency has a significant impact on superconducting properties.

Superconductivity

Magnetic properties in condensed matter

Electron-Hole Asymmetry Observed in Photoinduced Phase Transition of Excitonic Insulators

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 electron-hole 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

The multilayer quantum Hall effect is discovered in an organic massless Dirac electron system, α-(BETS)₂I₃ 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

Novel Insights Into Bulk Reconstruction in the Anti-de Sitter/Conformal Field Theory Correspondence

Bulk reconstruction in anti-de Sitter/conformal field theory is fundamental to our understanding of quantum gravity. We show that contrary to popular belief, bulk reconstruction is rather simple and intuitive.

Theoretical Particle Physics

Fingerprint of Majorana Zero Modes through Nonlocal Measurements

The enhancement and robustness of the 2π periodic Aharonov-Bohm effect can serve as a nonlocal probe of Majorana zero modes in topological superconductors that are not restricted by fermion parity.

Superconductivity

Microswimmer Hydrodynamics Through the Lens of Jeffery’s Orbits

This review article summarizes the latest progress on Jeffery’s orbits and how they relate to the motion of microswimmers of various shapes, including sperms, bacteria, and even microrobots.

Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics

Cross-disciplinary physics and related areas of science and technology

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

The Stolz–Teichner Conjecture and Supermoonshine

We check the validity of the "divisibility property," predicted by the Stolz–Teichner conjecture, for several infinite families of theories built from Duncan’s Supermoonshine module. Along the way, we develop the tools necessary to construct the so-called "periodicity class."

Theoretical Particle Physics

Heavy Fermion Meets Antiferromagnetic Sea

CeMnSi exhibits heavy fermion behaviors in an antiferromagnetically ordered state of Mn.
The space-time inversion symmetry inherent in the ordered state is key for the unique electron state.

Magnetic properties in condensed matter

A Closed Bosonic String Field Theory Based on the Fokker–Planck Formalism

A string field theory for closed bosonic strings is formulated using pants decomposition and the Fokker–Planck formalism.

Theoretical Particle Physics

Possible New State in CeB₆ Uncovered by Extremely Low-Frequency Nuclear Quadrupole Resonance Experiments

Extremely low-frequency nuclear quadrupole resonance analyses of CeB₆, a prototypical antiferroquadrupole (AFQ) material, indicate the possible existence of a new state in the zero-field AFQ ordered phase.

Magnetic properties in condensed matter

Pushing the Frontiers: On the Tenth Anniversary of Progress of Theoretical and Experimental Physics

The journal Progress of Theoretical and Experimental Physics (PTEP) celebrates its tenth (10th) anniversary in 2023. On this occasion, we take stock of some of its most notable publications.

Fractional Topological Charge Construction in a U(1) Lattice Gauge Theory Framework

We have constructed a fractional topological charge in the lattice Abelian gauge theory formalism, which avoids the issue of infinite degrees of freedom in continuum spacetime quantum field theory.

Theoretical Particle Physics

LiteBIRD: A New Frontier in the Search of Cosmic Inflation Imprint

The newly selected LiteBIRD satellite aims to detect cosmic inflation signals by identifying the imprint of primordial gravitational waves in the Cosmic Microwave Background polarization.

Astrophysics, cosmology, and geophysics

What Determines Non-Newtonian Flow Behavior in Glass-Forming Liquids?

Even minute structural changes can lead to significant reductions in the flow resistances of glass-forming liquids. Here, possible scenarios and predictions for two different classes of glass-forming liquids are provided.

Cross-disciplinary physics and related areas of science and technology

Structure and mechanical and thermal properties in condensed matter

Clockwise or Anticlockwise, That is the Question: Phonons with Angular Momentum in Chiral Crystals

Chiral crystals have lattice structures with no mirror or inversion symmetries.
A few basic questions about their unique phonon excitations with intrinsic angular momentum are answered.

Structure and mechanical and thermal properties in condensed matter

Non-Trivial Superconductivity in the Semimetal EuAuBi

　Magnetic order and superconductivity coexist in a noncentrosymmetric topological semimetal, EuAuBi. EuAuBi exhibits a large, anisotropic critical field with Rashba spin–orbit coupling, which can help develop superconducting spintronic materials.

Superconductivity

Magnetic properties in condensed matter

Hidden Magnetoelectric Phase Transition by Emergent Staggered Magnetic Field

Emergent staggered magnetic fields induce phase transition in the multiferroic material Ba₂FeSi₂O₇.
This study established a design principle utilizing emergent staggered magnetic fields to obtain an enhanced physical response.

Magnetic properties in condensed matter

Angle-Resolved Photoelectron Spectroscopy Microscopy: A Tool to Accelerate Nanomaterials Research

Researchers have published a practical guide on new uses of photoelectron microscopy combined with valence band dispersion analysis. They visualized several-micrometers-wide 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

Cross-disciplinary physics and related areas of science and technology

Powered by Machine Learning: Obtaining Spectral Conductivity and Chemical Potential of Thermoelectric Materials from Experimental Data

We propose a machine-learning method to obtain the fundamental physical quantity, namely, the spectral conductivity, from experimental data of thermoelectric coefficients. Our study introduces a new data-driven approach that reveals the underlying low-energy electronic states of high-performance thermoelectric materials.

Structure and mechanical and thermal properties in condensed matter

Net-Pattern of Muskmelon Rind Favors a Common Mathematical Law

The surface of muskmelon is covered with a fine mesh-like net-pattern. The geometric features of the fine mesh appear unique for each individual, but hide an unexpected mathematical rule.

Cross-disciplinary physics and related areas of science and technology

Statistical physics and thermodynamics

Thickness-Dependent Oscillation Behavior of Magnetic Phase Transitions in Pt Ultrathin Films with Small Orbital Moment

Ferromagnetism in nano-Pt films originates from the quantum-confinement effect that depends on film thickness. Studies of the electronic states of nano-Pt will aid in developing methods for efficiently utilizing its large spin-orbit coupling.

Magnetic properties in condensed matter