Robust localized zero-energy modes from locally embedded PT-symmetric defects

Mostafavi, Fatemeh and Yuce, Cem and Magana-Loaiza, Omar S. and Schomerus, Henning and Ramezani, Hamidreza (2020) Robust localized zero-energy modes from locally embedded PT-symmetric defects. Physical Review Research, 2 (3): 032057. ISSN 2643-1564

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Abstract

We demonstrate the creation of robust localized zero-energy states that are induced into topologically trivial systems by the insertion of a PT-symmetric defect with local gain and loss. A pair of robust localized states induced by the defect turns into zero-energy modes when the gain-loss contrast exceeds a threshold, at which the defect states encounter an exceptional point. Our approach can be used to obtain robust lasing or perfectly absorbing modes in any part of the system.