We review recent developments in the research of nonlinear and nonequilibrium
phenomena in solids focusing on their geometrical aspects. We start with introducing the …

We provide a model capable of accounting for the multiferroicity in certain materials. The
model's base is on free electrons and spin moments coupled within nonrelativistic quantum …

Direct conversion from terahertz photon to charge current is a key phenomenon for terahertz
photonics. Quantum geometrical description of optical processes in crystalline solids …

Inspired by recent advancements in the bulk photovoltaic effect which can extend beyond
the independent-particle approximation (IPA), this study delves into the influence of …

We study the nonlinear magnon spin current induced by an ac electric field under light
irradiation in collinear antiferromagnets with broken inversion symmetry. For linearly …

We theoretically study photocurrents in metals that break both inversion P and time reversal
T symmetries within the transparent region. We find that the system under the ac electric …

The scientific article investigates the illumination of a homogeneous non-polar medium
without an inversion center, which leads to the appearance of a stationary photovoltaic …

The responses of materials to high intensity light, ie, nonlinear optical responses, constitute
a vast field of physics and engineering. One of nonlinear optical responses that are …