Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/80713
Title: Exceptional points in a non-Hermitian topological pump
Authors: Hu, Wenchao
Wang, Hailong
Shum, Perry Ping
Chong, Yi Dong
Keywords: Classical Optics
Edge States
DRNTU::Science::Physics
Issue Date: 2017
Source: Hu, W., Wang, H., Shum, P. P., & Chong, Y. D. (2017). Exceptional points in a non-Hermitian topological pump. Physical Review B, 95(18), 184306-. doi:10.1103/PhysRevB.95.184306
Series/Report no.: Physical Review B
Abstract: We investigate the effects of non-Hermiticity on topological pumping and uncover a connection between a topological edge invariant based on topological pumping and the winding numbers of exceptional points. In Hermitian lattices, it is known that the topologically nontrivial regime of the topological pump only arises in the infinite-system limit. In finite non-Hermitian lattices, however, topologically nontrivial behavior can also appear, and we show that this can be understood as the effect of encircling a pair of exceptional points during a pumping cycle. This phenomenon is observed experimentally in a non-Hermitian microwave network containing variable-gain amplifiers.
URI: https://hdl.handle.net/10356/80713
http://hdl.handle.net/10220/46593
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.95.184306
Rights: © 2017 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [http://dx.doi.org/10.1103/PhysRevB.95.184306]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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