Journal
PHYSICAL REVIEW B
Volume 96, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.060202
Keywords
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Funding
- ERC [679722]
- EPSRC [EP/P010180/1]
- National Science Foundation [PHYS-1607611]
- DST, India [SB/S2/RJN128/2016]
- EPSRC [EP/P010180/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/P010180/1] Funding Source: researchfish
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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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