JPS Hot Topics

Fluid flows are often significantly complex. Even a simple flow requires thousands of modes to describe its temporal state at each moment. To understand the dynamics of such systems, researchers have explored methods to reduce the number of flow variables, while not compromising the dynamic behavior. The concept is known as dimensionality reduction. Traditional studies […]

In conventional superconductors, a Cooper pair is a time-reversed pair of two electrons on the Fermi surface, resulting in a state with zero Cooper pair’s momentum. However, when time-reversal symmetry is broken—for example, by applying a magnetic field—the spin degeneracy of the Fermi surface is lifted. This spin splitting can enable the formation of Cooper […]

Diamonds are the hardest known material, widely used in jewelry, cutting tools, and high-technology applications. They also have remarkable physical properties, such as a wide bandgap and excellent thermal conductivity, making them ideal for scientific and industrial applications. Recently, synthetic diamonds, which are artificially grown diamonds with very few impurities, have attracted attention in quantum […]

The Hanbury–Brown Twiss effect (HBTe). Just turned seventy. Old-school optics? Not quite.Still sparking curiosity – if you don’t take it for granted. It’s not about wave interference, but intensity interference. Sounds outrageous?It’s actually one of the cleanest windows into a mind-bending, hard-to-grasp truth about the quantum – something only a physics experiment can uncover. So, […]

As a new class of ordered state, “ferroaxial order”, characterized by a rotational structural distortion with axial vector symmetry, has recently attracted considerable interest owing to its potential for unconventional physical phenomena and new functionalities. For example, the ferroaxial order reportedly causes transverse responses, in which input external fields induce output conjugate physical quantities along […]

Quantum hydrodynamics investigates the dynamics of quantum fluids, which emerges owing to quantum condensations at ultralow temperatures, e.g., superfluid 4He, superfluid 3He, and atomic Bose-Einstein condensates. An important topic is the turbulent state of quantum fluids, known as quantum turbulence (QT). QT can be realized as the chaotic tangle of quantized vortices, which exhibit definite […]

Modern society has been sustained through the development of semiconductor devices based on Moore’s law. However, as the era of Moore’s law is drawing to a close, semiconductor research should shift toward next-generation technologies, namely beyond-CMOS technologies. In this context, electronic devices utilising strongly correlated electron materials have attracted attention as promising candidates. In particular, […]

The “magnetic shape memory effect”, which describes the phenomenon of deformed materials returning to their original shape upon exceeding a certain magnetic field, can be adopted for applications such as field-tuned actuators, as it offers much faster controllability than does the temperature-driven shape memory effect. The magnetic shape memory effect has been studied predominantly in […]

Chiral materials, such as helical crystals, exhibit unique symmetries that give rise to physical phenomena that are not observed in achiral (nonchiral) systems. One of the most intriguing topics in recent years has been the emergence of chiral phonons: the quanta of lattice wave in which the rotational motion of atoms propagates with a non-zero […]