Year2022

NEW
Inertial Focusing of Red Blood Cells in Square Tube Flows
202298
Red blood cells flowing through square capillary tubes were observed to migrate towards four points located on the diagonal in the tube crosssection, owing to their deformability and inertia.
Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics

NEW
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

Optical Tweezer Arrays with Ytterbium Atoms for Studying Quantum Phenomena
2022824
A neutral Rydberg atom tweezer array is a promising platform for quantum computation. In this study, featuring its metastable excited state, an array of single ytterbium atoms trapped in microoptical tweezers was constructed. This overcomes many problems in conventional systems using alkali atoms.
Atomic and molecular physics

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

PICKUP
Open String Field Theory Beyond Feynman Diagrams
202289
Theoretical physicists propose an alternative way of performing perturbative calculations in an open string field theory that has no analogy in the standard quantum field theory formalism.
Elementary particles, fields, and strings
Theoretical Particle Physics

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

Exploring Superconductivity in the Close Proximity of PolarNonpolar Structural Phase Transition
2022726
A polarnonpolar structural phase transition and corresponding increase in superconducting transition temperature T_{c }are observed in chemically doped PtBi_{2}. T_{c} increases as the system approaches the phase boundary.
Superconductivity

PTEP SPECIAL SECTION
New Phases of Matter: Topological Physics in the 21^{st} Century
2022719
Researchers from Japan highlight in an editorial our current understanding of topological phases of matter, focusing on the classification of the newly discovered symmetry protected topological phases.
Theoretical Particle Physics
Fundamental Theory of Condensed Matter Physics, Statistical Mechanics, Fluid Dynamics,
Superconductivity

Giant Vortices of Fish: Mechanisms and Patterns
2022712
The origin of giant rotating clusters of fish is revealed by a new agentbased model that incorporates the topological nature of interactions and the escape response characteristic to fish.
Crossdisciplinary physics and related areas of science and technology

PICKUP
Calculating Impedances for a Particle Accelerator
202277
In a new study, scientists provide a more comprehensive picture of dealing with the impedances of a twodimensional conductive cylindrical beam pipe with walls of finite thickness and spacecharge forces simultaneously.
Beam Physics

Origin of Metamagnetic Transition (MMT) in the SpinTriplet Superconductivity in UTe_{2}
202274
Stateoftheart magnetostriction measurements in a pulsedmagnetic field reveal the origin of a metamagnetic transition of spintriplet superconductor UTe_{2}. We propose that the uranium valence fluctuation plays a crucial role in its metamagnetic and superconducting transitions.
Superconductivity
Magnetic properties in condensed matter

PICKUP
Unraveling the Unique Properties of Icosahedral Quasicrystals
2022628
Scientists review the magnetism, nonFermi liquid behavior, and quantum critical behavior observed in icosahedral quasicrystals (QCs), and compare these properties with that of heavy fermions and approximant crystals.
Magnetic properties in condensed matter
Structure and mechanical and thermal properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

PICKUP
Testing the Viability of Muon Accelerators
2022621
Researchers demonstrate the viability of a radiofrequency linear accelerator to accelerate stopped muons to the speed of light.
Experimental Particle Physics

New Chiral Molecular Ferroelectrics
2022614
A new chiral ferroelectric material is discovered in a purely organic system, 1,1’bi2naphthol・2 dimethyl sulfoxide (BINOL・2DMSO).
Dielectric, optical, and other properties in condensed matter

PICKUP
Tensor Networks Across Physics
202267
Researchers from Japan provide the first comprehensive review of the historical development of tensor networks from a statistical mechanics viewpoint, with a focus on its theoretical background.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Statistical physics and thermodynamics
Magnetic properties in condensed matter

Towards Radionuclide Cancer Therapy with High Purity ^{177}Lu from Enriched ^{176}Yb Samples
202263
A method was developed to estimate the isotopic compositions of enriched ^{176}Yb sample required for producing radionuclide ^{177}Lu used for cancer therapy, with high radionuclide purity in accelerators.
Nuclear physics
Crossdisciplinary physics and related areas of science and technology

Simulating Strongly Coupled Quantum Field Theory with Quantum Algorithms
2022527
Nonperturbative quantum field theory problems can often be difficult to solve with classical algorithms. Researchers now develop quantum computing algorithms to understand such problems in the Hamiltonian formalism.
Theoretical Particle Physics

Understanding Relaxor Ferroelectrics with Simple Landau Theory
2022523
Thirdorder nonlinear dielectric susceptibility is measured in the paraelectric phase of Pb(Sc_{1/2}Ta_{1/2})O_{3}. The linear and nonlinear dielectric susceptibility results can be consistently explained based on the Landautype freeenergy density.
Dielectric, optical, and other properties in condensed matter
Structure and mechanical and thermal properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

Getting Around the Sign Problem to Solve an Open Quantum System
2022518
Researchers from Japan have found a novel nonequilibrium quantum system that doesn’t have the sign problem. The transport properties of the system are simulated with a Monte Carlo approach.
Elementary particles, fields, and strings
Theoretical Particle Physics

PICKUP
Quantum Anomaly in a Dirac Fermion System with Spacetime Dependent Mass
2022427
Scientists investigate quantum anomalies in a system of Dirac fermions with spacetime dependent mass and show that the anomaly formulas can be expressed in terms of superconnections.
Theoretical Particle Physics
Elementary particles, fields, and strings

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

FourDimensional XY Quantum Phase Transition in Superfluid Helium4
2022318
Liquid helium confined in nanopores exhibits a quantum superfluid transition at absolute zero. Investigations have revealed that the quantum nature also dominates the finitetemperature superfluid transition, obeying a simple meanfield theory.
Structure and mechanical and thermal properties in condensed matter

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

Unusual Nonlinear Conductivity in ChargeOrdered α(BEDTTTF)_{2}I_{3}
202239
Unusual nonlinear conduction is detected in organic molecular salt α(BEDTTTF)_{2}I_{3}. The observed thirdorder nonlinear conductivity implies a quadrupole instability hidden in this chargeordered organic salt.
Electronic transport in condensed matter

Economic Irreversibility: The Universal Guiding Principle of Infection Control
202231
It is preferable to avoid lockdowns, as lockdowns at seriously spread phases are very expensive. It would be economically better to utilize less intense countermeasures as early as possible to avoid lockdowns in later phases.
Statistical physics and thermodynamics
Crossdisciplinary physics and related areas of science and technology

HighPrecision Observation of Cosmic Gammaray Sources with the GRAINE Telescope
2022224
A gammaray telescope developed jointly by universities in Japan promises an unprecedented imaging resolution that could help distinguish gammaray sources observed in our galaxy.
Measurement, instrumentation, and techniques

Calculating Superconformal Index of 𝓝 = 4 SuperYangMills Theory for Finite N
2022222
The examination of AdS/CFT correspondence for finite N, where quantum gravitational effects become important, reveals that finite N corrections for the superconformal index can be reproduced as D3 brane contributions.
Theoretical Particle Physics

Realizing Spin Liquids Experimentally with Kapellasitetype Quantum Kagome Antiferromagnet
2022210
This study reports the observation of the spin fluctuation in a quantum kagome antiferromagnet CaCu_{3}(OH)_{6}Cl_{2}·0.6H_{2}O which persists down to 82 mK using the μSR technique.
Magnetic 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.
Electronic structure and electrical properties of surfaces and nanostructures
Structure and mechanical and thermal properties in condensed matter
Electron states in condensed matter

New Systematic Analysis Method of Identifying Microscopic Essential Couplings
2022131
We propose a systematic method of identifying essential model parameters for nonlinear response tensors. The analysis results reveal fundamental couplings in nontrivial responses and promote further development of multiferroic responses.
Electronic transport in condensed matter
Dielectric, optical, and other properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

Shedding Light on Nonreciprocal Directional Dichroism at High Magnetic Fields in a Multiferroic Material
2022119
Large optical nonreciprocal directional dichroism, coupled with an antiferromagnetic order parameter, is observed in a high magnetic field via magnetooptical spectroscopy combined with a pulse magnet technique.
Dielectric, optical, and other properties in condensed matter
Magnetic properties 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