Coherence length and quantum geometry in a dilute flat-band superconductor

Autor:	Iskin, M.
Rok vydání:	2024
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Quantum Gases Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. B 110, 144505 (2024)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.110.144505
Popis:	To explore the influence of quantum-geometric effects on the Ginzburg-Landau coherence length in a dilute flat-band superconductor, we adopt a BCS-BEC crossover approach to the multiband pyrochlore-Hubbard model near the critical temperature for superconductivity. Our self-consistent formulation for this three-dimensional lattice benchmarks very well against the so-called zero-temperature coherence length, demonstrating the monotonic decay of the coherence length to zero as the interaction strength increases. Additionally, we show that the effective mass of the many-body bound states (i.e., Cooper pairs) is nearly identical to that of the lowest-lying two-body bound states in the dilute flat-band limit. Comment: 10 pages with 3 figures. To appear in PRB
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2407.08449 Zobrazit plný text záznamu View this record from Arxiv