Eigenstate Thermalisation in a Locally Perturbed Integrable System
Citation:
Brenes, M., LeBlond, T., Goold, J., Rigol, M., Eigenstate Thermalisation in a Locally Perturbed Integrable System, Physical Review Letters, 2020, 125, 070605, 7;Abstract:
Eigenstate thermalization is widely accepted as the mechanism behind thermalization in generic isolated quantum systems. Using the example of a single magnetic defect embedded in the integrable spin-1/2 XXZ chain, we show that locally perturbing an integrable system can give rise to eigenstate thermalization. Unique to such setups is the fact that thermodynamic and transport properties of the unperturbed integrable chain emerge in properties of the eigenstates of the perturbed (nonintegrable) one. Specifically, we show that the diagonal matrix elements of observables in the perturbed eigenstates follow the microcanonical predictions for the integrable model, and that the ballistic character of spin transport in the integrable model is manifest in the behavior of the off-diagonal matrix elements of the current operator in the perturbed eigenstates.
Sponsor
Grant Number
Science Foundation Ireland
Author's Homepage:
http://people.tcd.ie/gooldjDescription:
PUBLISHED
Author: Goold, John
Sponsor:
Science Foundation IrelandType of material:
Journal ArticleCollections
Series/Report no:
Physical Review Letters;125;
7;
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Full text availableKeywords:
Quantum spin models, Eigenstate thermalization, Nonequilibrium statistical mechanics, Transport phenomenaDOI:
https://doi.org/10.1103/PhysRevLett.125.070605Metadata
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