Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion

• URL: http://arxiv.org/abs/2308.13375v4
• Date: Mon, 11 Mar 2024 16:36:52 GMT
• Title: Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion
• Authors: Javier Arg\"uello-Luengo and Manfred J. Mark and Francesca Ferlaino and Maciej Lewenstein and Luca Barbiero and Sergi Juli\`a-Farr\'e
• Abstract summary: Thouless pumping represents a powerful concept to probe quantized topological invariants in quantum systems. We show that sufficiently large intersite interactions allow for an interaction-induced recovery of Thouless pumps. Our results provide a new mechanism to stabilize Thouless pumps in interacting quantum systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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