Role of interaction-induced tunneling in the dynamics of polar lattice bosons

authored by: Adith Sai Aramthottil, Mateusz Łącki, Luis Santos, Jakub Zakrzewski
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.
Organisation(s): Institute of Theoretical Physics
QuantumFrontiers
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s): Jagiellonian University
Type: Article
Journal: Physical Review B
Volume: 107
No. of pages: 9
ISSN: 2469-9950
Publication date: 22.03.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Electronic version(s): https://doi.org/10.48550/arXiv.2209.11644 (Access: Open)
https://doi.org/10.1103/PhysRevB.107.104305 (Access: Closed)

BibTeX

@article{252d76fb2ac34ecabe9b04080e6b08a5,
title = "Role of interaction-induced tunneling in the dynamics of polar lattice bosons",
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.",
author = "Aramthottil, {Adith Sai} and Mateusz {\L}{\c a}cki and Luis Santos and Jakub Zakrzewski",
note = "Funding Information: M.{\L}. and J.Z. thank R. Kraus and G. Morigi for discussions on density dependent tunnelings and Wannier function integrals. We acknowledge support of National Science Centre (Poland) via Opus Grants No. 2019/35/B/ST2/00034 (A.S.A.) and 2019/35/B/ST2/00838 (M.{\L}.). This research was also funded by National Science Centre (Poland) under the OPUS call within the WEAVE program 2021/43/I/ST3/01142 (J.Z.) as well as by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Project No. 274200144–SFB 1227 DQ-mat within the project A04, and under Germany's Excellence Strategy, EXC-2123 Quantum-Frontiers 390837967. Partial support by the Strategic Programme Excellence Initiative at Jagiellonian University is also acknowledged. Some of the numerical computations have been possible thanks to PL-Grid Infrastructure. ",
year = "2023",
month = mar,
day = "22",
doi = "10.48550/arXiv.2209.11644",
language = "English",
volume = "107",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Institute of Physics",
number = "10",
}