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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.
Li et al. (Tue,) studied this question.