Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: Transport: Poster

TT 59.18: Poster

Mittwoch, 20. März 2024, 15:00–18:00, Poster E

Delocalization in a partially disordered interacting many-body system — •Suman Mondal and Fabian Heidrich-Meisner — Institut für Theoretische Physik, Georg-August-Universität Göttingen, Göttingen, Germany

We study a partially disordered one-dimensional system with interacting particles. Concretely, we only impose a disorder potential to every other site, followed by a clean site. The numerical analysis of finite systems reveals that the ergodic regime with a large entanglement extends to higher disorder strengths compared to a fully disordered system. More importantly, at large disorder, there exist eigenstates with large entanglement entropies and significant correlations between the clean sites. These states have almost volume-law scaling, embedded into a sea of area-law states, reminiscent of inverted scar states. These eigenstate features leave fingerprints in the nonequilibrium dynamics even at large disorder regime, with a significant initial state dependence. We demonstrate that certain types of initial charge density wave states decay significantly, while others preserve their initial inhomogeneity as is typical for many-body localized systems. This initial condition-dependent dynamics may give us extra control over the system to study delocalization dynamics at large disorder strength and should be experimentally feasible with ultracold atoms in optical lattices.

This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via FOR 5522.

Keywords: Many-body localization; Quantum thermalization; Non-equilibrium dynamics; Eigenstate thermalization hypothesis; Strongly correlated systems