Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion
Abstract
Thouless pumping represents a powerful concept to probe quantized topological invariants in quantum systems. We explore this mechanism in a generalized Rice-Mele Fermi-Hubbard model characterized by the presence of competing onsite and intersite interactions. Contrary to recent experimental and theoretical results, showing a breakdown of quantized pumping induced by the onsite repulsion, we prove that sufficiently large intersite interactions allow for an interaction-induced recovery of Thouless pumps. Our analysis further reveals that the occurrence of stable topological transport at large interactions is connected to the presence of a spontaneous bond-order-wave in the ground-state phase diagram of the model. Finally, we discuss a concrete experimental setup based on ultracold magnetic atoms in an optical lattice to realize the newly introduced Thouless pump. Our results provide a new mechanism to stabilize Thouless pumps in interacting quantum systems.
Cite
@article{arxiv.2308.13375,
title = {Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion},
author = {Javier Argüello-Luengo and Manfred J. Mark and Francesca Ferlaino and Maciej Lewenstein and Luca Barbiero and Sergi Julià-Farré},
journal= {arXiv preprint arXiv:2308.13375},
year = {2024}
}
Comments
9 pages, 5 figures. Added new Figure 4. Accepted for publication in Quantum