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Broken bulk-boundary correspondence in the non-Hermitian superconductive chain with the identity determinant of transfer matrix

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  • Wang, Huanyu
  • Liu, Wuming

Abstract

We have constructed a new type of topological end mode, named η, satisfying η†=iη,η2=−i, and demonstrate the topological characteristics of a quantum chain with isolated η modes on separated ends. Remarkably, we present that for a non-Hermitian superconductive chain with combined η mode and Majorana mode γ on different ends, the bulk-boundary correspondence is broken, even though the determinant of the transfer matrix is identity. When the tunneling parameters are tuned to make the system Hermitian, the bulk-boundary correspondence gets recovered. We demonstrate that such broken bulk-boundary correspondence has unique physical origins. Meanwhile, it is observed that the fractional Josephson effect does not exist in the junction with combined η−γ modes and the AC will not remain the sinusoidal form, despite of the well-defined fermion parity. Such effects can be utilized to detect the dissipation rate of the system. Experimentally, we propose to simulate chains with η modes, as well as combined η−γ modes, via electrical circuits.

Suggested Citation

  • Wang, Huanyu & Liu, Wuming, 2023. "Broken bulk-boundary correspondence in the non-Hermitian superconductive chain with the identity determinant of transfer matrix," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 619(C).
  • Handle: RePEc:eee:phsmap:v:619:y:2023:i:c:s0378437123002881
    DOI: 10.1016/j.physa.2023.128733
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    References listed on IDEAS

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    1. Deyuan Zou & Tian Chen & Wenjing He & Jiacheng Bao & Ching Hua Lee & Houjun Sun & Xiangdong Zhang, 2021. "Observation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
    2. Eric J. Meier & Fangzhao Alex An & Bryce Gadway, 2016. "Observation of the topological soliton state in the Su–Schrieffer–Heeger model," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    3. Kohei Kawabata & Sho Higashikawa & Zongping Gong & Yuto Ashida & Masahito Ueda, 2019. "Topological unification of time-reversal and particle-hole symmetries in non-Hermitian physics," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
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