Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 62: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1

TT 62.9: Vortrag

Donnerstag, 23. März 2017, 12:00–12:15, HSZ 304

Quantum Mutual Information as a Probe for Many-Body Localization — •Giuseppe De Tomasi, Soumya Bera, Jens Bardarson, and Frank Pollmann — MPI-PKS , Dresden Germany

We demonstrate that the quantum mutual information (QMI) is a useful probe to study many-body localization (MBL). First, we focus on the detection of a metal–insulator transition for two different models, the noninteracting Aubry-André-Harper model and the spinless fermionic disordered Hubbard chain. We find that the QMI in the localized phase decays exponentially with the distance between the regions traced out, allowing us to define a correlation length, which converges to the localization length in the case of one particle. Second, we show how the QMI can be used as a dynamical indicator to distinguish an Anderson insulator phase from an MBL phase. By studying the spread of the QMI after a global quench from a random product state, we show that the QMI does not spread in the Anderson insulator phase but grows logarithmically in time in the MBL phase.