Journal
PHYSICAL REVIEW B
Volume 98, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.155142
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [11674021, 11650110441]
- French government through the UCAJEDI Investments [ANR-15-IDEX-01]
- National Research Foundation, Prime Minister's Office, Singapore
- Ministry of Education-Singapore under the Research Centres of Excellence programme
- [NSAF-U1530401]
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We use unbiased numerical methods to study the onset of pair superfluidity in a system that displays flat bands in the noninteracting regime. This is achieved by using a known example of flat band systems, namely, the Creutz lattice, where we investigate the role of local attractive interactions in the U < 0 Hubbard model. Going beyond the standard approach used in these systems where weak interactions are considered, we map the superfluid behavior for a wide range of interaction strengths and exhibit a crossover between BCS and tightly bound bosonic fermion pairs. We further contrast these results with a standard two-leg fermionic ladder, showing that the pair correlations, although displaying algebraic decay in both cases, are longer ranged in the Creutz lattice, signifying the robustness of pairing in this system.
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