Being motivated by intriguing phenomena, such as the breakdown of conventional bulk
boundary correspondence and the emergence of skin modes in the context of non-Hermitian …

The cooperation between time-periodic driving fields and non-Hermitian effects could
endow systems with distinctive spectral and transport properties. In this paper, we uncover …

After extensive investigation of the Floquet second-order topological insulator (FSOTI) in two
dimensions, here we propose two driving schemes to systematically engineer the hierarchy …

We review the recent development in constructing higher-order topological band insulators
under strong periodic drivings. In particular, we focus on various approaches in formulating …

We introduce a new class of out-of-equilibrium noninteracting topological phases: the
topological space-time crystals. These are time-dependent quantum systems that do not …

Linear mechanical systems with time-modulated parameters can harbor oscillations with
amplitudes that grow or decay exponentially with time due to the phenomenon of parametric …

We propose a three-step periodic drive protocol to engineer two-dimensional (2D) Floquet
quadrupole superconductors and three-dimensional (3D) Floquet octupole superconductors …

The presence of random disorder in a metallic system accounts for the localization of
extended states in general. On the contrary, the presence of disorder can induce topological …

This work reports the general design and characterization of two exotic, anomalous
nonequilibrium gapless topological phases. In equilibrium systems, the Weyl nodes or the …

Periodically driven systems with internal and spatial symmetries can exhibit a variety of
anomalous boundary behaviors at both the zero and π quasienergies despite the trivial bulk …