期刊
PHYSICAL REVIEW B
卷 98, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.205417
关键词
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资金
- Singapore NRF [NRF-NRFI2017-04, R-144-000-378-281]
- Singapore Ministry of Education Academic Research Fund Tier I (WBS) [R-144-000-353-112]
Topological states of matter in non-Hermitian systems have attracted a lot of attention due to their intriguing dynamical and transport properties. In this paper, we propose a periodically driven non-Hermitian lattice model in one dimension, which features rich Floquet topological phases. The topological phase diagram of the model is derived analytically. Each of its non-Hermitian Floquet topological phases is characterized by a pair of integer winding numbers, counting the number of real zero- and pi-quasienergy edge states at the boundaries of the lattice. Non-Hermiticity-induced Floquet topological phases with unlimited winding numbers are found, which allow arbitrarily many real zero- and pi-quasienergy edge states to appear in the complex quasienergy bulk gaps in a well-controlled manner. We further suggest probing the topological winding numbers of the system by dynamically imaging the stroboscopic spin textures of its bulk states.
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