Bulk-boundary correspondence of non-Hermitian systems with translational invariance breaking

Datum

15.10.2025

Zeit

10:00 - 11:00

Sprecher

Hongfang Liu

Zugehörigkeit

School of Physical Science and Technology, Soochow University, Suzhou, China

Sprache

en

Hauptthema

Materialien

Host

Grit Rötzer

Beschreibung

In this talk, I will present our recent work on bulk-boundary correspondence in non-Hermitian systems without translational invariance. I will first introduce the modified generalized Brillouin zone theory that captures the influence of disorder, magnetic effects [1], and non-orientability [2] on the non-Hermitian skin effect. This framework reveals how the skin effect interacts with disorder or magnetic effects, and how a Möbius strip geometry alters the skin mode’s behavior. Having extended the applicability of bulk-boundary correspondence to non-Hermitian systems without translational symmetry, I will then turn to our studies about topological states in non-Hermitian systems. By introducing real-space topological invariances, we study the disorder-induced phase transitions in non-Hermitian topological systems, and discover the non-Hermitian topological Anderson insulator [3] and higher-order topological Anderson insulator [4]. Finally, we propose an experimental scheme for detecting the Chern number in non-Hermitian Chern insulators based on the distribution of split subbands under a magnetic field [5]. References: [1] H. F. Liu, M. Lu, Z.-Q. Zhang, and H. Jiang, Phys. Rev. B 107, 144204 (2023). [2] H. F. Liu, M. Peng, Q. Wei, Z.-Q. Zhang, Z. Huang, C. H. Lee, J. B. Gong, H. Jiang, and G. Chen, Phys. Rev. Lett. under Review. [3] H. F. Liu, Z. X. Su, Z. Q. Zhang, and H. Jiang, Chin. Phys. B 29, 050502 (2020) (invited). [4] H. F. Liu, J. K. Zhou, B. L. Wu, Z. Q. Zhang, and H. Jiang, Phys. Rev. B 103, 224203 (2021). [5] H. F. Liu, M. Lu, S. Chai, Z.-Q. Zhang, and H. Jiang, Phys. Rev. B 109, 155404 (2024). .

Links

• Seminars at the IFW

Letztmalig verändert: 15.10.2025, 07:35:07