Control of non-Hermitian skin effect by staggered synthetic gauge fields

Scientific paper - Original scientific paper

• Author: Huiyan Tang
• Author: Ziteng Wang
• Author: Liqin Tang
• Author: Daohong Song
• Author: Zhigang Chen
• Author: Hrvoje Buljan
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Synthetic gauge fields introduce an unconventional degree of freedom for studying many fundamental phenomena in different branches of physics. Here, we propose a scheme to use staggered synthetic gauge fields for control of the non-Hermitian skin effect (NHSE). A modified Su–Schrieffer–Heeger model is employed, where two dimer chains with non-reciprocal coupling phases are coupled, exhibiting non-trivial point-gap topology and the NHSE. In contrast to previous studies, the skin modes in our model are solely determined by the coupling phase terms associated with the staggered synthetic gauge fields. By manipulating such gauge fields, we can achieve maneuvering of skin modes as well as the bipolar NHSE. As a typical example, we set up a domain wall by imposing different synthetic gauge fields on two sides of the wall, thereby demonstrating flexible control of the non-Hermitian skin modes at the domain wall. Our scheme opens a new avenue for the creation and manipulation of NHSE by synthetic gauge fields, which may find applications in beam shaping and non-Hermitian topological devices.

• Keywords (english): synthetic gauge fields; non-Hermitian skin effect (NHSE)
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: APL Photonics
• Numbering: vol. 9, no. 5, 056102
• e-ISSN: 2378-0967
• DOI: https://doi.org/10.1063/5.0196844
• URN:NBN: urn:nbn:hr:217:108007
• Publication: 2024-05-01
• Project: Number: KK.01.1.1.01.0004; Title (croatian): Provedba vrhunskih istraživanja u sklopu Znanstvenog centra izvrsnosti za kvantne i kompleksne sustave te reprezentacije Liejevih algebri; Title (english): Implementation of top research within the Scientific Center of Excellence for Quantum and Complex Systems, and Representations of Lie Algebras; Acronym: QuantiXLie; Leader: Hrvoje Buljan; Jurisdiction: eu; Funding stream: European Regional Development Fund
• Document URL: https://pubs.aip.org/app/article/9/5/056102/3287792/Control-of-non-Hermitian-skin-effect-by-staggered
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Submitted: 9 January 2024. Accepted: 15 April 2024. Published Online: 1 May 2024.
• Created on: 2024-06-10 11:58:58