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  • PhysRevB.96.060202

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One-particle density matrix occupation spectrum of many-body localized states after a global quench

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Article number060202(R)
<mark>Journal publication date</mark>23/08/2017
<mark>Journal</mark>Physical review B
Issue number6
Volume96
Number of pages6
Publication StatusPublished
<mark>Original language</mark>English

Abstract

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.

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©2017 American Physical Society