4.6 Article

Entanglement-assisted tunneling dynamics of impurities in a double well immersed in a bath of lattice trapped bosons

Journal

NEW JOURNAL OF PHYSICS
Volume 22, Issue 2, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ab6eab

Keywords

many-body physics; impurities; optical lattice; correlations

Funding

  1. Deutsche Forschungsgemeinschaft [SFB 925]
  2. Studienstiftung des deutschen Volkes
  3. framework of the Lenz-Ising Award of the University of Hamburg

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We unravel the correlated tunneling dynamics of an impurity trapped in a double well and interacting repulsively with a majority species of lattice trapped bosons. Upon quenching the tilt of the double well it is found that the quench-induced tunneling dynamics depends crucially on the interspecies interaction strength and the presence of entanglement inherent in the system. In particular, for weak couplings the impurity performs a rather irregular tunneling process in the double well. Increasing the interspecies coupling it is possible to control the response of the impurity which undergoes a delayed tunneling while the majority species effectively acts as a material barrier. For very strong interspecies interaction strengths the impurity exhibits a self-trapping behavior. We showcase that a similar tunneling dynamics takes place for two weakly interacting impurities and identify its underlying transport mechanisms in terms of pair and single-particle tunneling processes.

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