Measurement, instrumentation, and techniques

Structure and mechanical and thermal properties in condensed matter

Newly developed neutron holography was applied to ferroelectric BaTiO₃ to evaluate oxygen displacement, providing important structural information for improving the ability of dielectric materials to store electricity.

Electron states in condensed matter

Measurement, instrumentation, and techniques

Strongly interacting quantum many-body states can be mapped to noninteracting quantum states, enabling a new quantum neural network called the Fermi machine to solve strongly correlated electron problems.

Cross-disciplinary physics and related areas of science and technology

Magnetic properties in condensed matter

Structure and mechanical and thermal properties in condensed matter

Cross-disciplinary physics and related areas of science and technology

Electron states in condensed matter

Magnetic properties in condensed matter

The correspondence principle states that as quantum numbers approach infinity, the nature of a system described by quantum mechanics should match that described by classical mechanics. Quantum phenomena, such as quantum superposition and quantum correlation, generally become unobservable when a system approaches this regime. Conversely, as quantum numbers decrease, classical descriptions give way to observable quantum effects. The external approach to classical–quantum crossover has attracted research interest. This study aims to demonstrate a method for achieving such control in materials.

Dielectric, optical, and other properties in condensed matter

Electron states in condensed matter

Based on the charge disproportionation of V³⁺ and V²⁺, the V³⁺(d²) trimers and V²⁺(d³) tetramers in the vanadium pyrochlore lattice of AlV₂O₄ are described by the orbitally-induced Peierls mechanism.