Direction reversal of non-Hermitian skin effect via coherent coupling

Abstract

Absolute negative mobility (ANM) in nonequilibrium systems depicts the possibility of particles propagating toward the opposite direction of an external force. We uncover in this work a phenomenon analogous to ANM regarding eigenstate localization and particle transport in non-Hermitian systems under the influence of the non-Hermitian skin effect (NHSE). A coherent coupling between two non-Hermitian chains individually possessing the same preferred direction of NHSE is shown to cause a direction reversal of NHSE for all eigenmodes. This concept is further investigated in terms of time evolution dynamics using a non-Hermitian quantum walk platform within reach of current experiments. Our findings are explained both qualitatively and quantitatively. The possible direction reversal of NHSE can potentially lead to interesting applications.

12 pages, 8 figures. Comments are welcome

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Cited by in corpus (10)

• Topological Non-Hermitian skin effect
• Photonic corner skin modes
• Occupation-dependent particle separation in one-dimensional non-Hermitian lattices
• A brief review of hybrid skin-topological effect
• Anderson Delocalization in Strongly Coupled Disordered Non-Hermitian Chains
• Dynamical suppression of many-body non-Hermitian skin effect in Anyonic systems
• Harnessing Nonlinearity to Tame Wave Dynamics in Nonreciprocal Active Systems
• Antichiral and trap-skin dynamics in a nonreciprocal bosonic two-leg ladder with artificial magnetic flux
• Solution of Wave Acceleration and Non-Hermitian Jump in Nonreciprocal Lattices
• Reversing non-Hermitian skin accumulation with a non-local transverse switch