External excitation enabled chirality reversal of exceptional points in an effective anti-PT-symmetric non-Hermitian system

Author:

Jian Yiran1ORCID,Wang Yuqian1,Guo Zhiwei1ORCID,Hu Shengyu1ORCID,Wu Bintao1ORCID,Yang Yaping1ORCID,Chen Hong1

Affiliation:

1. MOE Key Laboratory of Advanced Micro-structured Materials, School of Physics Sciences and Engineering, Tongji University , Shanghai 200092, China

Abstract

As a kind of phase singularity in physical systems, exceptional points (EPs) give rise to a plethora of counterintuitive phenomena, such as the asymmetric state transfer and unidirectional reflection. Especially, the eigenvectors of EP are self-orthogonal, and an inherent chirality can be determined because of the “missing dimension.” Beyond traditional wisdom, in this work, we proposed theoretically an effective anti-parity-time symmetry in a non-Hermitian system under the external excitation, and the chirality reversal from resonance EP to absorption EP is demonstrated experimentally. The essence of this phenomenon is that the external input is involved in the establishment of the eigenstates of the system. Moreover, the critical condition of chirality reversal between two types of EPs in the non-Hermitian system is analytically given. This external excitation-controlled EP not only paves an effective way to study the fundamental non-Hermitian physics in an open system but also holds great potential in the applied photonic devices such as the chiral antenna, polarization converter, and wireless communication.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Fundamental Research Funds for Central Universities

Chengguang Program of Shanghai Education Development Foundation and Shanghai Municipal Education Commission

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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