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• W3201352009 abstract "We relate topological properties of non-Hermitian systems and observables of quantum open systems by using the Keldysh path-integral method. We express Keldysh Green's functions in terms of effective non-Hermitian Hamiltonians that contain all the relevant topological information. We arrive at a frequency dependent topological index that is linked to the response of the system to perturbations at a given frequency. We show how to detect a transition between different topological phases by measuring the response to local perturbations. Our formalism is exemplified in a 1D Hatano-Nelson model, highlighting the difference between the bosonic and fermionic cases" @default.
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• W3201352009 date "2022-07-25" @default.
• W3201352009 modified "2023-10-18" @default.
• W3201352009 title "Bridging the gap between topological non-Hermitian physics and open quantum systems" @default.
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• W3201352009 doi "https://doi.org/10.1103/physreva.106.l011501" @default.
• W3201352009 hasPublicationYear "2022" @default.
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