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DY: Fachverband Dynamik und Statistische Physik

DY 66: Many-body Quantum Dynamics II

DY 66.2: Vortrag

Freitag, 20. März 2020, 10:15–10:30, HÜL 186

Quantum Many-Body Scars in Doubly Modulated Optical Lattices — •Hongzheng Zhao¹, Joseph Vovrosh¹, Florian Mintert¹, and Johannes Knolle^1,2 — ¹Blackett Laboratory, Imperial College London, London, United Kingdom — ²Department of Physics, Technische Universitt Mnchen, Garching, Germany

The concept of quantum many-body scars has recently been introduced to explain the weak ergodicity breaking experimentally observed in a Rydberg atom platform. There, exceptionally long coherent oscillations are observed for quenches from a set of special initial states. Such scared eigenstates, which are concentrated in a small fragment of the total Hilbert space, have been discovered theoretically in a number of spin and fermionic models. Here, we propose a simple setup to generate quantum many-body scars in a doubly modulated Bose-Hubbard system which can be readily implemented in cold atomic gases. In the high frequency limit, we show that the dynamics is governed by density assisted tunneling. We find the optimal driving parameters for the kinetically constrained hopping which leads to small isolated subspaces of scared eigenstates. We discuss the experimental signatures and analyze the transition to fully thermalizing behavior as a function of driving frequency.