Angle-resolved photoemission spectroscopy (ARPES), with its exceptional sensitivity to both
the binding energy and the momentum of valence electrons in solids, provides unparalleled …

High-harmonic spectroscopy, an ultrafast all-optical technique initially conceptualized in
atomic and molecular systems, has now emerged as a powerful platform for studying the …

High harmonic generation (HHG) has developed in recent years as a promising tool for
ultrafast materials spectroscopy. At the forefront of these advancements, several works …

The nonlinear Hall effect due to Berry curvature dipole (BCD) induces frequency doubling,
which was recently observed in time-reversal-invariant materials. Here we report novel …

In the last decade, there has been a proliferation of laser sources for time-and angle-
resolved photoemission spectroscopy (TR-ARPES), building on the proven capability of this …

In topological insulators (TI) for surface electron transport, dissipationless surface states are
required and are activated by symmetry breaking usually by reducing thickness of the film …

One of the most notable manifestations of electronic properties of topological insulators is
the dependence of the photocurrent direction on the helicity of circularly polarized optical …

Ultrafast charge and spin dynamics have immense effects on the applications of topological
insulators (TIs). By performing spin-adiabatic nonadiabatic molecular dynamics simulations …

The photogalvanic effect (PGE) occurring in noncentrosymmetric materials enables the
generation of an open-circuit voltage that is much larger than the bandgap, making it rather …

The topology of the electronic band structure of solids can be described by its Berry
curvature distribution across the Brillouin zone. We theoretically introduce and …