Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1
TT 62.12: Vortrag
Donnerstag, 23. März 2017, 12:45–13:00, HSZ 304
Occupation spectrum after a global quench in the many-body localized phase — Talía Lezama Mergold Love1, Soumya Bera1,3, and •Jens Hjorleifur Bardarson1,2 — 1Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany — 2Department of Theoretical Physics, KTH Royal Institute of Technology, Stockholm, SE-106 91 Sweden — 3Department of Physics, IIT Bombay, India
Closed disordered interacting quantum systems can exhibit many-body localization (MBL). When disorder is sufficiently strong, such systems enter into a nonergodic regime known as the many-body localized phase, resulting in an ideal insulator with zero charge and thermal conductivities at finite energy densities. The emergent integrability of the MBL phase can be understood in terms of localized quasiparticles. As a result, the occupations of the one-particle density matrix (OPDM) in eigenstates show a fermi-liquid like discontinuity. In this work, we numerically explore the dynamics of the MBL phase generated by a global quench from a charge density state, in terms of the OPDM occupation spectrum. In particular, we show that in the steady state, the occupation discontinuity is smeared to a continuous distribution in a similar way as finite temperature smears the discontinuity in a fermi liquid, but the occupation spectrum remains highly non-thermal in the thermodynamic limit.