Topologically protected defect states in open photonic systems with non-Hermitian charge-conjugation and parity-time symmetry

Malzard, Simon and Poli, Charles Joseph and Schomerus, Henning Ulrich (2015) Topologically protected defect states in open photonic systems with non-Hermitian charge-conjugation and parity-time symmetry. Physical review letters, 115 (20). ISSN 1079-7114

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Abstract

We show that topologically protected defect states can exist in open (leaky or lossy) systems even when these systems are topologically trivial in the closed limit. The states appear from within the continuum, thus in the absence of a band gap, and are generated via exceptional points (a spectral transition that occurs in open wave and quantum systems with a generalized time-reversal symmetry), or via a degeneracy induced by charge-conjugation symmetry (which is related to the pole transition of Majorana zero modes). We demonstrate these findings for a leaking passive coupled-resonator optical waveguide with asymmmetric internal scattering, where the required symmetries (non-Hermitian versions of time-reversal symmetry, chirality, and charge conjugation) emerge dynamically.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
76625
Deposited By:
Deposited On:
12 Nov 2015 09:14
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Oct 2020 02:20