Extension of the eigenstate thermalization hypothesis to nonequilibrium steady states

We extend the notion of the eigenstate thermalization hypothesis (ETH) to open quantum systems governed by the Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) master equation. We present evidence that the eigenstates of nonequilibrium steady-state (NESS) density matrices obey a generalization of ETH in...

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Bibliographic Details
Published in:Physical review. B 2019-07, Vol.100 (4), p.045112, Article 045112
Main Authors: Moudgalya, Sanjay, Devakul, Trithep, Arovas, D. P., Sondhi, S. L.
Format: Article
Language:English
Subjects:
Bulk density
Eigenvectors
Hypotheses
Many body interactions
Steady state
Thermalization (energy absorption)
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Summary:We extend the notion of the eigenstate thermalization hypothesis (ETH) to open quantum systems governed by the Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) master equation. We present evidence that the eigenstates of nonequilibrium steady-state (NESS) density matrices obey a generalization of ETH in boundary-driven systems when the bulk Hamiltonian is nonintegrable, just as eigenstates of Gibbs density matrices are conjectured to do in equilibrium. This generalized ETH, which we call NESS ETH, can be used to obtain representative pure states that reproduce the expectation values of few-body operators in the NESS. The density matrices of these representative pure states can be further interpreted as weak solutions of the GKLS master equation. Additionally, we explore the validity and breakdown of NESS-ETH in the presence of symmetries, integrability, and many-body localization in the bulk Hamiltonian.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.045112