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Chin. Phys. B, 2022, Vol. 31(1): 010308    DOI: 10.1088/1674-1056/ac3738
Special Issue: SPECIAL TOPIC — Non-Hermitian physics
SPECIAL TOPIC—Non-Hermitian physics Prev   Next  

Non-Hermitian Weyl semimetals: Non-Hermitian skin effect and non-Bloch bulk-boundary correspondence

Xiaosen Yang(杨孝森), Yang Cao(曹阳), and Yunjia Zhai(翟云佳)
Department of physics, Jiangsu University, Zhenjiang 212013, China
Abstract  We investigate novel features of three-dimensional non-Hermitian Weyl semimetals, paying special attention to the unconventional bulk-boundary correspondence. We use the non-Bloch Chern numbers as the tool to obtain the topological phase diagram, which is also confirmed by the energy spectra from our numerical results. It is shown that, in sharp contrast to Hermitian systems, the conventional (Bloch) bulk-boundary correspondence breaks down in non-Hermitian topological semimetals, which is caused by the non-Hermitian skin effect. We establish the non-Bloch bulk-boundary correspondence for non-Hermitian Weyl semimetals: the topological edge modes are determined by the non-Bloch Chern number of the bulk bands. Moreover, these topological edge modes can manifest as the unidirectional edge motion, and their signatures are consistent with the non-Bloch bulk-boundary correspondence. Our work establishes the non-Bloch bulk-boundary correspondence for non-Hermitian topological semimetals.
Keywords:  non-Hermitian skin effect      Weyl semimental      bulk-boundary correspondence  
Received:  23 August 2021      Revised:  04 November 2021      Accepted manuscript online:  06 November 2021
PACS:  03.65.Vf (Phases: geometric; dynamic or topological)  
  73.43.Nq (Quantum phase transitions)  
  73.20.At (Surface states, band structure, electron density of states)  
Fund: We would like to thank Zhong Wang for fruitful discussion. Project supported by the National Natural Science Foundation of China (Grants No. 11504143).
Corresponding Authors:  Xiaosen Yang     E-mail:  yangxs@ujs.edu.cn

Cite this article: 

Xiaosen Yang(杨孝森), Yang Cao(曹阳), and Yunjia Zhai(翟云佳) Non-Hermitian Weyl semimetals: Non-Hermitian skin effect and non-Bloch bulk-boundary correspondence 2022 Chin. Phys. B 31 010308

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