The advent of intense ultrashort optical pulses spanning a frequency range from terahertz to
the visible has opened a new era in the experimental investigation and manipulation of …

Surface nonlinear optics are essential for developments in integrated photonics and
micro/nano optoelectronics. However, the nonlinear optical conversion efficiency on a …

The correlated insulator (CI) states and the recently discovered density wave (DW) states in
magic-angle twisted bilayer graphene (TBG) have stimulated intense research interest …

Broken symmetries and electronic topology are well manifested together in the second-order
nonlinear optical responses from topologically non-trivial materials. Although second-order …

While the surface-bulk correspondence has been ubiquitously shown in topological phases,
the relationship between surface and bulk in Landau-like phases is much less explored …

Superconductivity, an emergence of a macroscopic quantum state, gives rise to unique
electromagnetic responses leading to perfect shielding of magnetic field and zero electrical …

In many quantum materials, strong electron correlations lead to the emergence of new states
of matter. In particular, the study in the last decades of the complex phase diagram of high …

The remarkable electromagnetic characteristics inherent in unconventional superconductors
have catalyzed the advancement of numerous technological innovations, spanning from …

Noncentrosymmetric superconductors offer fascinating phenomena of quantum transport
and optics such as nonreciprocal and nonlinear responses. Time-reversal symmetry …

The unique nonreciprocal responses of superconductors, which stem from the Cooper pairs'
quantum condensation, have been attracting attention. Recently, theories of the second …