Year2023

Possible Origin of High Thermoelectric Power Factor in Ultrathin FeSe: A Twoband Model
20231221
The high thermoelectric power factor observed in ultrathin FeSe can be theoretically explained by a twoband 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
Crossdisciplinary physics and related areas of science and technology

Quantum Dripping of Superfluid ^{4}He
20231215
Superfluid ^{4}He droplets exhibit robustly quantized dripping periods despite gradually varying input flow rates owing to their high amplitude and undamped oscillation.

OneWay Optical Waveguide Realized by Edge Modes of Topological Photonic Crystals
20231212
A oneway optical waveguide was realized on the boundary between two types of photonic crystals with different topological properties, which were demonstrated by highresolution infrared reflection measurements.
Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics
Dielectric, optical, and other properties in condensed matter

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Exploring Recent Advances in the Physics of Biofluid Locomotion
2023128
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
Crossdisciplinary 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 CsCoCl_{3 }with IsingLike Exchange Interaction
20231113
The results of highfield electron spin resonance measurements in the millimeterwave to terahertz region reveal unconventional magnetic excitation in S = 1/2 onedimensional antiferromagnets.
Magnetic properties in condensed matter

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Highly Accurate Estimation of Beta Decay Rates for Heavy Nuclei
2023117
Physicists from Japan present complete formulas that consider the induced current and velocitydependent 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
2023112
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
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.
Superconductivity
Crossdisciplinary physics and related areas of science and technology
Electron states in condensed matter

Discovering a Local Fluctuation Theorem with Machine Learning
20231020
A groundbreaking study reveals a new timelocal 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 DyRu_{2}Si_{2} ~Spontaneous Alignment of Emergent Ferromagnetic Spin Textures?~
20231017
We measured the ac susceptibility of the frustrated magnet DyRu_{2}Si_{2}, in the partially ordered phase, where emergent 2dimensional (2D) disordered planes appear, and revealed extraordinarily slow and unconventional dynamics, which could be attributed to the highly fluctuating nature of the emergent 2D planes.
Magnetic properties in condensed matter

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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.
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
202398
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 Xray Diffraction
202395
The unique sense of rotation of the cycloidal magnetic order was clarified in noncentrosymmetric EuIrGe_{3} by using circularly polarized resonant xray diffraction.
Magnetic properties in condensed matter

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

Exploring Vortex Dynamics in a Multiband Superconductor
2023822
We measured the microwave fluxflow Hall effect in FeSe, where the cancellation of holes and electrons was observed. This is a novel effect of multiband superconductors.
Superconductivity

Toward Accurate Diamond Quantum Sensing
2023816
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
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

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SelfEnergy 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.
Superconductivity
Electron states in condensed matter

Investigating Δ and Ω Baryons as Meson–Baryon Bound States in Lattice Quantum Chromodynamics
2023713
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

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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

Ultra Purification Unveils the Intrinsic Nature in SpinTriplet Superconductor UTe_{2}
202375
Microscopic spinsusceptibility measurements in ultrapure UTe_{2} samples reveal that superconducting symmetry is analogous to the superfluidity of the ^{3}He Bphase and that U deficiency has a significant impact on superconducting properties.
Superconductivity
Magnetic properties 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

Novel Insights Into Bulk Reconstruction in the Antide Sitter/Conformal Field Theory Correspondence
202361
Bulk reconstruction in antide 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
2023523
The enhancement and robustness of the 2π periodic AharonovBohm effect can serve as a nonlocal probe of Majorana zero modes in topological superconductors that are not restricted by fermion parity.
Superconductivity

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Microswimmer Hydrodynamics Through the Lens of Jeffery’s Orbits
2023518
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
Crossdisciplinary physics and related areas of science and technology

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Towards 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.
Structure and mechanical and thermal properties in condensed matter
Crossdisciplinary 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
2023425
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 socalled "periodicity class."
Theoretical Particle Physics

Heavy Fermion Meets Antiferromagnetic Sea
2023418
CeMnSi exhibits heavy fermion behaviors in an antiferromagnetically ordered state of Mn.
The spacetime 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
2023411
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 CeB_{6 }Uncovered by Extremely LowFrequency Nuclear Quadrupole Resonance Experiments
202343
Extremely lowfrequency nuclear quadrupole resonance analyses of CeB_{6}, a prototypical antiferroquadrupole (AFQ) material, indicate the possible existence of a new state in the zerofield AFQ ordered phase.
Magnetic properties in condensed matter

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Pushing the Frontiers: On the Tenth Anniversary of Progress of Theoretical and Experimental Physics
2023330
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
2023327
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
2023322
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 NonNewtonian Flow Behavior in GlassForming Liquids?
2023320
Even minute structural changes can lead to significant reductions in the flow resistances of glassforming liquids. Here, possible scenarios and predictions for two different classes of glassforming liquids are provided.
Crossdisciplinary 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
202337
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

NonTrivial Superconductivity in the Semimetal EuAuBi
2023222
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
2023217
Emergent staggered magnetic fields induce phase transition in the multiferroic material Ba_{2}FeSi_{2}O_{7}.
This study established a design principle utilizing emergent staggered magnetic fields to obtain an enhanced physical response.Magnetic properties 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

Powered by Machine Learning: Obtaining Spectral Conductivity and Chemical Potential of Thermoelectric Materials from Experimental Data
2023131
We propose a machinelearning method to obtain the fundamental physical quantity, namely, the spectral conductivity, from experimental data of thermoelectric coefficients. Our study introduces a new datadriven approach that reveals the underlying lowenergy electronic states of highperformance thermoelectric materials.
Structure and mechanical and thermal properties in condensed matter

NetPattern of Muskmelon Rind Favors a Common Mathematical Law
2023112
The surface of muskmelon is covered with a fine meshlike netpattern. The geometric features of the fine mesh appear unique for each individual, but hide an unexpected mathematical rule.
Crossdisciplinary physics and related areas of science and technology
Statistical physics and thermodynamics

ThicknessDependent Oscillation Behavior of Magnetic Phase Transitions in Pt Ultrathin Films with Small Orbital Moment
202316
Ferromagnetism in nanoPt films originates from the quantumconfinement effect that depends on film thickness. Studies of the electronic states of nanoPt will aid in developing methods for efficiently utilizing its large spinorbit coupling.
Magnetic properties in condensed matter