Superfluid stiffness for the attractive Hubbard model on a honeycomb optical lattice
arXiv:1901.05612 · doi:10.1103/PhysRevA.99.023608
Abstract
In addition to the conventional contribution that is directly controlled by the single-particle energy spectrum, the superfluid phase stiffness of a two-component Fermi gas has a geometric contribution that is governed by the quantum metric of the honeycomb's band structure. Here, we take both contributions into account, and construct phase diagrams for the critical superfluid transition temperature as a function of the chemical potential, particle filling, onsite interaction and next-nearest-neighbor hopping. Our theoretical approach is based on a self-consistent solution of the BCS mean-field theory for the stationary Cooper pairs and the universal BKT relation for the phase fluctuations.
arXiv comment7 pages with 4 figures; to appear in PRA
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Cited by in corpus (10)
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- Geometric contribution to the Goldstone mode in spin-orbit coupled Fermi superfluids
- Pairs, trimers and BCS-BEC crossover near a flat band: the sawtooth lattice
- Quantum geometric superfluid weight in multiband superconductors: A microscopic interpretation
- Emergence of charge density wave and superconducting phase transitions through Lorentz-invariant interactions in the Haldane-Hubbard model
- Predictive power of the Berezinskii-Kosterlitz-Thouless theory based on Renormalization Group throughout the BCS-BEC crossover in 2D superconductors
- Connection between the semiconductor--superconductor transition and the spin-polarized superconducting phase in the honeycomb lattice
- Revisiting flat band superconductivity: dependence on minimal quantum metric and band touchings
- Theory of Hofstadter Superconductors