High-temperature transport in the one-dimensional mass-imbalanced Fermi-Hubbard model
Abstract
We study transport in the one-dimensional mass-imbalanced Fermi-Hubbard model in the high-temperature limit, focusing on the case of strong interactions. Prior theoretical and experimental investigations have revealed unconventionally long transport timescales, with complications due to strong finite-size effects. We compute the dynamical current-current correlation function directly in the thermodynamic limit using infinite tensor network techniques. We show that transport in the strong-imbalance limit is dominated by AC resonances, which we compute with an analytic expansion. We study the dephasing of these resonances with mass imbalance, η . In the small-imbalance limit, the model is nearly integrable. We connect these unusual limits by computing the DC conductivity and transport decay time as a function of η and the interaction strength U /t . We propose an experimental protocol to measure these correlation functions in cold atom experiments.
- Publication:
-
Physical Review A
- Pub Date:
- June 2024
- DOI:
- 10.1103/PhysRevA.109.063318
- arXiv:
- arXiv:2404.08076
- Bibcode:
- 2024PhRvA.109f3318K
- Keywords:
-
- Condensed Matter - Quantum Gases;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 13 pages, 6 figures