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One-particle density matrix occupation spectrum of many-body localized states after a global quench
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 6, article id 060202Article in journal (Refereed) Published
Abstract [en]

The emergent integrability of the many-body localized phase is naturally understood in terms of localized quasiparticles. As a result, the occupations of the one-particle density matrix in eigenstates show a Fermi-liquid-like discontinuity. Here, we show that in the steady state reached at long times after a global quench from a perfect density-wave state, this occupation discontinuity is absent, reminiscent of a Fermi liquid at a finite temperature, while the full occupation function remains strongly nonthermal. We discuss how one can understand this as a consequence of the local structure of the density-wave state and the resulting partial occupation of quasiparticles. This partial occupation can be controlled by tuning the initial state and can be described by an effective temperature.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 6, article id 060202
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Physical Sciences
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URN: urn:nbn:se:kth:diva-214325DOI: 10.1103/PhysRevB.96.060202ISI: 000408197400001Scopus ID: 2-s2.0-85028774299OAI: oai:DiVA.org:kth-214325DiVA, id: diva2:1141221
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QC 20170914

Available from: 2017-09-14 Created: 2017-09-14 Last updated: 2018-09-19Bibliographically approved

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