Year: 2023
Type: article
Abstract: Intersite dipolar interactions induce, even in absence of disorder, an intriguing nonergodic 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 intersite interactions. As a result, in stark contrast to the more studied case of hard-core bosons, delocalization is counterintuitively strengthened when the dipolar strength increases. Furthermore, the quasicancellation 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 nonergodic 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.
Institutions: Jagiellonian University, Leibniz University Hannover
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G138431067, G1929867868, G2117391915, G4285572622, EXC 2123: QuantumFrontiers Licht und Materie an der Quantengrenze, G6386048849, SFB 1227: Designte Quantenzustände der Materie (DQmat) Herstellung, Manipulation und Detektion für metrologische Anwendungen und Tests fundamentaler Physik, G745383156
OpenAlex ID: W4353063251