JPS Hot Topics

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