Loss-induced Floquet non-Hermitian skin effect

A mechanism for a loss-induced Floquet non-Hermitian skin effect (NHSE) is proposed, where gain/loss combined with Floquet engineering leads to the NHSE. This mechanism utilizes periodic coupling, which is a well-established experimental method, to realize the NHSE through loss instead of nonreciprocal coupling. The key to this mechanism is the Floquet-induced next-nearest neighbor coupling. This proposal is also applicable to high-dimensional systems and can be realized in photonic waveguides and other related systems.