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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Computation of phonons using first principles has many applications for understanding crystal properties. This review provides an overview of the present capabilities of such simulations using finite displacement supercell approach.

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.

Researchers from Japan highlight, in a recent review, the range of material properties that can be and have been studied using the phenomenon of femtosecond laser-induced terahertz radiation emission.

We theoretically demonstrate spin related conductivity under electric ferro-axial ordering. We show an intrinsic generation of a spin current parallel to an applied electric field in metals and insulators.

Although Mn is an elementary metal, the antiferromagnetic state of α-Mn is still obscure. Our NMR study on high-quality α-Mn provides new insights into the symmetry of its antiferromagnetism.

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

Iron-based superconductor, Ba_1-xRb_xFe₂As₂, exhibits “strange metal” behavior—linear dependence of resistivity on temperature. It seems that hidden electronic nematic fluctuations play a greater role than the well-known antiferromagnetic fluctuations.

Based on the Kubo–Luttinger linear response theory, we discovered that the low-T Seebeck coefficient for Mott variable-range hopping in a d-dimensional system varies as S ∝ T^d/(d+1), which is different from the conventional S ∝ T^{(d−1)/(d+1)}. In addition, the experimental data for S of CuCrTiS₄ at low T are in excellent agreement with our prediction S ∝ T^3/4 (d = 3).

The spatial distributions of ferroelectric and structural phase transitions in quantum paraelectric SrTiO₃ under uniaxial stress were microscopically observed using birefringence imaging techniques.

The intrinsic anomalous thermal Hall effect can be an effective probe for the order parameters of non-unitary pairing states of the putative spin-triplet superconductor UTe₂

Red blood cells flowing through square capillary tubes were observed to migrate towards four points located on the diagonal in the tube cross-section, owing to their deformability and inertia.

“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.

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 micro-optical tweezers was constructed. This overcomes many problems in conventional systems using alkali atoms.

Diverse magnetic orderings are found to be produced by spin-orbit coupled electrons on the kagome lattice. This finding provides a unified guiding principle for the design of magnetic topological materials.

We theoretically suggest that topological Weyl superconductivity can be realized by applying a supercurrent to noncentrosymmetric line-nodal superconductors with spin–orbit coupling.

A polar-nonpolar structural phase transition and corresponding increase in superconducting transition temperature T_c are observed in chemically doped PtBi₂. T_c increases as the system approaches the phase boundary.

The origin of giant rotating clusters of fish is revealed by a new agent-based model that incorporates the topological nature of interactions and the escape response characteristic to fish.

State-of-the-art magnetostriction measurements in a pulsed-magnetic field reveal the origin of a metamagnetic transition of spin-triplet superconductor UTe₂. We propose that the uranium valence fluctuation plays a crucial role in its metamagnetic and superconducting transitions.

Scientists review the magnetism, non-Fermi liquid behavior, and quantum critical behavior observed in icosahedral quasicrystals (QCs), and compare these properties with that of heavy fermions and approximant crystals.

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.

A method was developed to estimate the isotopic compositions of enriched ¹⁷⁶Yb sample required for producing radionuclide ¹⁷⁷Lu used for cancer therapy, with high radionuclide purity in accelerators.

Third-order nonlinear dielectric susceptibility is measured in the paraelectric phase of Pb(Sc_1/2Ta_1/2)O₃. The linear and nonlinear dielectric susceptibility results can be consistently explained based on the Landau-type free-energy density.

We propose that spin current in an organic conductor, α-(BETS)₂I₃, is an appropriate physical quantity to detect the topological nature of the material whose electrons obey a quasi-two-dimensional Dirac equation.

We study equilibrium current fluctuations in systems without time-reversal symmetry, violating the fluctuation-dissipation theorem. Notably, the off-diagonal fluctuation is insensitive to system imperfections in contrast to other fluctuations and conductivity.

Liquid helium confined in nanopores exhibits a quantum superfluid transition at absolute zero. Investigations have revealed that the quantum nature also dominates the finite-temperature superfluid transition, obeying a simple mean-field theory.

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.

Unusual nonlinear conduction is detected in organic molecular salt α-(BEDT-TTF)₂I₃. The observed third-order nonlinear conductivity implies a quadrupole instability hidden in this charge-ordered organic salt.

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.

This study reports the observation of the spin fluctuation in a quantum kagome antiferromagnet CaCu₃(OH)₆Cl₂·0.6H₂O which persists down to 82 mK using the μSR technique.

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.

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.

Large optical nonreciprocal directional dichroism, coupled with an antiferromagnetic order parameter, is observed in a high magnetic field via magneto-optical spectroscopy combined with a pulse magnet technique.

Although the screening of an external electric field, strongly influences the electronic states of two-dimensional material stack, it is not well understood. Magnetotransport measurements of twisted double bilayer graphene uncovered the screening of atomic layers.