Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion

by Javier Argüello-Luengo, Manfred J. Mark, Francesca Ferlaino, Maciej Lewenstein, Luca Barbiero, Sergi Julià-Farré

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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Reference:

Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion,
Javier Argüello-Luengo, Manfred J. Mark, Francesca Ferlaino, Maciej Lewenstein, Luca Barbiero, Sergi Julià-Farré,
Quantum, 8, 1285, 2024.

Bibtex Entry:

@article{ArgelloLuengo2024soh,
  title = {Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion},
  volume = {8},
  ISSN = {2521-327X},
  url = {http://dx.doi.org/10.22331/q-2024-03-14-1285},
  DOI = {10.22331/q-2024-03-14-1285},
  journal = {Quantum},
  publisher = {Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften},
  author = {Arg"{u}ello-Luengo,  Javier and Mark,  Manfred J. and Ferlaino,  Francesca and Lewenstein,  Maciej and Barbiero,  Luca and Julià-Farré,  Sergi},
  year = {2024},
  month = mar,
  pages = {1285},
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.},
  eprint={2308.13375},
  archivePrefix={arXiv},
  primaryClass={cond-mat.quant-gas},
arXiv = {https://arxiv.org/abs/2308.13375}
}