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DY: Fachverband Dynamik und Statistische Physik

DY 53: Poster: Quantum Dynamics, Chaos and Information; Many Body Systems

DY 53.7: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

Violation of eigenstate thermalization in an interacting flat-band system — •Mirko Daumann and Thomas Dahm — Universität Bielefeld, Germany

Flat-band systems are characterized by the presence of completely dispersionless bands. They have interesting properties, because they possess a macroscopic degeneracy, zero group velocity and infinite effective mass. Recently, flat bands have been realized experimentally in various different physical systems.

Here we investigate the role of a particle-particle interaction on the thermalization in a quasi one-dimensional flat band system. By time evolution, we show that thermalization is not reached both in terms of the inverse participation ratio (IPR) and local operator expectation values. We further validate our results by showing that our system violates the eigenstate thermalization hypothesis (ETH) even in the presence of a particle-particle interaction.