Direction reversal of non-Hermitian skin effect via coherent coupling

• URL: http://arxiv.org/abs/2203.07400v1
• Date: Mon, 14 Mar 2022 18:00:27 GMT
• Title: Direction reversal of non-Hermitian skin effect via coherent coupling
• Authors: Linhu Li, Wei Xin Teo, Sen Mu, Jiangbin Gong
• Abstract summary: 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.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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