JPS Hot Topics

The statistical physics analysis of learning parametric models was revisited by combining the replica method with a grand canonical ensemble and variational approach, enabling prediction error estimation for learning systems with real data.

This study developed a first-principles tight-binding framework that systematically evaluates higher-order spin interactions to enable the quantitative analysis and design of complex magnetic properties in materials.

In high-field ESR measurements, the quantum phase transition in the S = 1/2 one-dimensional Ising-like antiferromagnet, driven by transverse magnetic fields, is strongly related to the softening of the spinon excitation.

Topochemical exchange converts Li₂CoTi₃O₈ into metastable Co₂Ti₃O₈ with a diamond network, showing strong J₁–J₂ frustration, T_N near 4.4 K, and four magnetization steps up to 50 T.

Nanodiamonds containing nitrogen-vacancy centers can be used to map pressure and nonhydrostatic stress inside diamond anvil cells to obtain micron-scale pressure landscapes that clarify local conditions affecting high-pressure materials research.

This Special Topics edition of the Journal of the Physical Society of Japan discusses the recent progress and future directions for the rapidly progressing field of photodriven quantum spin systems.

The proposed hybrid quantum-classical computing method enables practical calculations of quasiparticle band structures to expand the possibilities for quantum materials research.

The special topics edition of the Journal of the Physical Society of Japan presents five new review articles offering cutting-edge information on the emerging field of topological photonics.

We demonstrate a new type of magnetoelectric effect in the pyroelectric ferrimagnet CaBaCo₄O₇—modulating its phase stability depending on the relative direction between the electric field and its electric polarization, enabling new material design strategies.

This work provides the first observation of the superconducting gap in molecular superconductors and their gap symmetry using photoemission spectroscopy, which will significantly accelerate the study of molecular conductors.