JPS Hot Topics

The study of unconventional superconductivity is central to modern condensed matter physics research. Unconventional superconductors are materials that exhibit superconductivity through mechanisms that are not explained by the conventional Bardeen-Cooper-Schrieffer (BCS) theory. Since its discovery in 1994, studies on the superconductivity of strontium ruthenate (Sr2RuO4), a layered perovskite, have established it as a strongly correlated […]

In quantum mechanics, quantum observables, like position, momentum, energy, and spin, are in general non-commutative, meaning that their measurement order may affect the outcome. As a result, it is generally impossible to measure them simultaneously. Consequently, their joint probability distributions cannot be defined, limiting a complete understanding of quantum systems. There have been many attempts […]