Speaker
Jens Bardarson
Description
The emergent integrability of the many-body localized phase
can be 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.
Furthermore, in the steady state reached at long times after
a global quench from a perfect density wave state, this
occupation discontinuity is absent but 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 and the resulting partial occupation of
quasiparticles. Phenomenologically, this is reminiscent of
the effect of temperature in Fermi liquids that results in
smearing of the occupation function.
