The role of interaction-induced tunneling in the dynamics of polar lattice bosons

• URL: http://arxiv.org/abs/2209.11644v4
• Date: Wed, 29 Mar 2023 13:58:43 GMT
• Title: The role of interaction-induced tunneling in the dynamics of polar lattice bosons
• Authors: Adith Sai Aramthottil, Mateusz \L\k{a}cki, Luis Santos, and Jakub Zakrzewski
• Abstract summary: Inter-site dipolar interactions induce non-ergodic dynamics for dipolar bosons in an optical lattice. For shallow-enough lattices, the delocalization stemming from the interaction-induced hopping overcomes the localization induced by inter-site interactions. Our results show that interaction-induced hopping should play a crucial role in future experiments on the dynamics of polar lattice gases.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Inter-site dipolar interactions induce, even in absence of disorder, an intriguing non-ergodic dynamics for dipolar bosons in an optical lattice. We show that the inherent dipole-induced density-dependent tunneling, typically neglected, plays a crucial role in this dynamics. For shallow-enough lattices, the delocalization stemming from the interaction-induced hopping overcomes the localization induced by inter-site interactions. As a result, in stark contrast to the more studied case of hard-core bosons, delocalization is counter-intuitively strengthen when the dipolar strength increases. Furthermore, the quasi-cancellation between bare and interaction-induced tunneling may lead, near a lattice-depth-dependent value of the dipole strength, to an exact decoupling of the Hilbert space between ergodic hard-core states and strongly non-ergodic soft-core ones. Our results show that interaction-induced hopping should play a crucial role in future experiments on the dynamics of polar lattice gases.

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