Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Correlated Electrons: Theory 1

TT 28.8: Vortrag

Donnerstag, 8. September 2022, 11:45–12:00, H23

Scrambling and Many-Body Localization in the XXZ-Chain — •Niklas Bölter and Stefan Kehrein — Institut für Theoretische Physik, Universität Göttingen

The tripartite information is an observable-independent measure for scrambling and delocalization of information. Therefore one can expect that the tripartite information is a good observable-independent indicator for distinguishing between many-body localized and delocalized regimes, which we confirm for the XXZ-chain in a random field. Specifically, we find that the tripartite information signal spreads inside a lightcone that only grows logarithmically in time in the many-body localized regime similar to the entanglement entropy. We also find that the tripartite information eventually reaches a plateau with an asymptotic value that is suppressed by strong disorder.

[1] N. Bölter and S. Kehrein, Phys. Rev. B 105, 104202