TY - JOUR

T1 - Role of interaction-induced tunneling in the dynamics of polar lattice bosons

AU - Aramthottil, Adith Sai

AU - Łącki, Mateusz

AU - Santos, Luis

AU - Zakrzewski, Jakub

N1 - Funding Information: M.Ł. 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.Ł.). 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.

PY - 2023/3/22

Y1 - 2023/3/22

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85151238705&partnerID=8YFLogxK

U2 - 10.48550/arXiv.2209.11644

DO - 10.48550/arXiv.2209.11644

M3 - Article

AN - SCOPUS:85151238705

VL - 107

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 10

M1 - 104305

ER -