Non-Hermitian Skin Effect In Periodically-Driven Dissipative Ultracold Atoms

• URL: http://arxiv.org/abs/2311.06550v1
• Date: Sat, 11 Nov 2023 12:00:16 GMT
• Title: Non-Hermitian Skin Effect In Periodically-Driven Dissipative Ultracold Atoms
• Authors: Zhao-Fan Cai and Tao Liu and Zhongmin Yang
• Abstract summary: The non-Hermitian skin effect (NHSE) is one of most striking properties in the fields of non-Hermitian physics. We study the NHSE in a 1D optical lattice by periodically-driven ultracold atoms in the presence of staggered atomic loss.
• Score: 2.321156185872456
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The non-Hermitian skin effect (NHSE), featured by the collapse of bulk-band eigenstates into the localized boundary modes of the systems, is one of most striking properties in the fields of non-Hermitian physics. Unique physical phenomena related to the NHSE have attracted a lot of interest, however, their experimental realizations usually require nonreciprocal hopping, which faces a great challenge in ultracold-atom systems. In this work, we propose to realize the NHSE in a 1D optical lattice by periodically-driven ultracold atoms in the presence of staggered atomic loss. By studying the effective Floquet Hamiltonian in the high-frequency approximation, we reveal the underlying mechanism for the periodic-driving-induced the NHSE. We found that the robust NHSE can be tuned by driving phase, which is manifested by the dynamical localization. Most remarkably, we uncover the periodic-driving-induced critical skin effect for two coupled chains with different driving phases, accompanied by the appearance of size-dependent topological in-gap modes. Our studies provide a feasible way for observing the NHSE and exploring corresponding unique physical phenomena due to the interplay of non-Hermiticity and many-body statistics in ultracold-atom systems.

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