학술논문

Solvable non-Hermitian skin effects and real-space exceptional points: non-Hermitian generalized Bloch theorem.
Document Type
Journal
Author
Zhang, Xintong (PRC-FUDAN-OSE) AMS Author Profile; Song, Xiaoxiao (PRC-FUDAN-OSE) AMS Author Profile; Zhang, Shubo (PRC-FUDAN-OSE) AMS Author Profile; Zhang, Tengfei (PRC-FUDAN-OSE) AMS Author Profile; Liao, Yuanjie (PRC-FUDAN-OSE) AMS Author Profile; Cai, Xinyi (PRC-FUDAN-OSE) AMS Author Profile; Li, Jing (PRC-FUDAN-OSE) AMS Author Profile
Source
Journal of Physics. A. Mathematical and Theoretical (J. Phys. A) (20240101), 57, no.~12, Paper No 125001, 16~pp. ISSN: 1751-8113 (print).eISSN: 1751-8121.
Subject
81 Quantum theory -- 81Q General mathematical topics and methods in quantum theory
  81Q12 Non-selfadjoint operator theory in quantum theory
Language
English
Abstract
Summary: ``Non-Hermitian systems can exhibit extraordinary boundary behaviors, known as the non-Hermitian skin effects, where all the eigenstates are localized exponentially at one side of lattice model. To give a full understanding and control of non-Hermitian skin effects, we have developed the non-Hermitian generalized Bloch theorem to provide the analytical expression for all solvable eigenvalues and eigenstates, in which translation symmetry is broken due to the open boundary condition. By introducing the Vieta's theorem for any polynomial equation with arbitrary degree, our approach is widely applicable for one-dimensional non-Hermitian tight-binding models. With the non-Hermitian generalized Bloch theorem, we can analyze the condition of existence or non-existence of the non-Hermitian skin effects at a mathematically rigorous level. Additionally, the non-Hermitian generalized Bloch theorem allows us to explore the real-space exceptional points. We also establish the connection between our approach and the generalized Brillouin zone method. To illustrate our main results, we examine two concrete examples including the Su-Schrieffer-Heeger chain model with long-range couplings, and the ladder model with non-reciprocal interaction. Our non-Hermitian generalized Bloch theorem provides an efficient way to analytically study various non-Hermitian phenomena in more general cases.''