
Exploring the Physics of Ferrimagnets for Future Spintronics Applications
202186
This Special Topics collection of the Journal of the Physical Society of Japan covers recent progress in spintronics research on ferrimagnetic materials.
Structure and mechanical and thermal properties in condensed matter
Electronic transport in condensed matter
Magnetic properties in condensed matter
Crossdisciplinary physics and related areas of science and technology

Understanding Skyrmion Crystal Formation in EuPtSi
202182
We theoretically demonstrate that the interplay between the spincharge and spinorbit couplings in itinerant magnets stabilizes fielddirection sensitive, shortperiod skyrmions. Our results can aid in engineering shortperiod skyrmions.
Magnetic properties in condensed matter

Will Magnetic Properties near Pressure Induced Quantum Critical Phenomena Be Elucidated?
2021726
Hiraoka et al. developed an opposed anviltype pressure cell for magnetization measurements which combines a large sample space and is capable of generating higher pressures up to 6.3 GPa.
Measurement, instrumentation, and techniques
Magnetic properties in condensed matter

PTEP SPECIAL SECTION
Atoms Trapped with Light Behave Like a Dissipative Quantum System
2021719
A team of researchers from Japan experimentally realize, for the first time, a dissipative, paritytime symmetric, manybody quantum system from ultracold atoms trapped in an optical lattice.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Gases, plasmas, electric discharges, and beams

PTEP SPECIAL SECTION
Nonreal Energies with Real Effects in Exotic Condensed Matter Systems
2021719
Scientists demonstrate the presence of nonHermitian topological properties preserved under continuous physical deformations in strongly correlated systems in equilibrium, resulting from shortlived quanta of collective excitations.
Electron states in condensed matter

PTEP SPECIAL SECTION
A Quantum Description of Physical Systems with Nonreal Energies
2021719
While quantum systems are traditionally described by Hermitian Hamiltonians, the formalism is extendable to a nonHermitian description for systems that are dissipative or obey paritytime symmetry.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Nuclear physics
Electron states in condensed matter
Gases, plasmas, electric discharges, and beams

PICKUP
Using Pulsed Cold Neutrons to Measure Neutron Lifetime
2021713
Scientists measure the lifetime of a neutron with pulsed neutron beams to explore the cause of a puzzling discrepancy in their previously measured lifetime.
Elementary particles, fields, and strings

Uncovering the Superlattice Structure of Calcium Iridium Oxide at Phase Transition
202179
Order parameter of nonmagnetic phase transition at 105 K, which is called "hidden order", was revealed in spinorbit coupled iridate Ca_{5}Ir_{3}O_{12}. This discover of order parameter with rotational and directional degrees of freedom in atomic scale will lead to development of energy saving devices with a fast crosscorrelated response.
Electron states in condensed matter
Structure and mechanical and thermal properties in condensed matter

PICKUP
Overlooked Materials Host Rich Physics of Strongly Correlated Electrons
202172
An international team of researchers reviews the research progress on strongly spinorbit coupled systems, providing an overview of theoretically predicted electronic phases, candidate materials, and unusual experimental observations.
Electron states in condensed matter
Magnetic properties in condensed matter
Electronic transport in condensed matter

Detecting Weak Quantum Magnetism at High Pressures
2021615
Improved device and method to measure magnetization under high pressure was developed, which brings a quick tool to screen phases of interest in weakly magnetic materials including quantum magnets.
Measurement, instrumentation, and techniques
Magnetic properties in condensed matter