Increasing superconducting Tc by layering in the attractive Hubbard model
Rodrigo A. Fontenele, Natanael C. Costa, Thereza Paiva, Raimundo R. dos Santos
DOI 10.1103/PhysRevA.110.053315 · Physical Review A
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The attractive Hubbard model has become a model readily realizable with ultracold atoms on optical lattices. However, the superconducting (superfluid) critical temperatures Tc's are still somewhat smaller than the lowest temperatures achieved in experiments. Here, we consider two possible routes, generically called layering, to increase Tc: a bilayer and a simple cubic lattice, both with tunable hopping tz between attractive Hubbard planes. We have performed minus-sign–free determinant quantum Monte Carlo simulations to calculate response functions such as pairing correlation functions, uniform spin susceptibility, and double occupancy, through which we map out some physical properties. We have found that by a judicious choice of fillings and intensity of on-site attraction, a bilayer can exhibit Tc's between 1.5 and 1.7 times those of the single layer; for the simple-cubic lattice the enhancement can be 30% larger than the maximum for the single layer. We also check the accuracy of both a BCS-like estimate for Tc in the attractive Hubbard model as well as of an upper bound for Tc based on the superfluid density.
Similar papers
Increasing superconducting by layering in the attractive Hubbard model
similarity 0.95Rodrigo A. Fontenele et al. · 2024 · arXiv:2408.17405
Source status unknown — claims are unverified
Optimizing the critical temperature and superfluid density of a metal-superconductor bilayer
similarity 0.92Yutan Zhang et al.
Source status unknown — claims are unverified
Enhanced superconductivity via layer differentiation in the trilayer Hubbard model
similarity 0.91Xun Liu & Mi Jiang
Source status unknown — claims are unverified
Superconductivity in the bilayer Hubbard model: Two Fermi surfaces are better than one
similarity 0.91Seher Karakuzu et al.
Source status unknown — claims are unverified
Enhancement of the superconducting critical temperature in layered compounds
similarity 0.89Zs. Gulácsi et al.
Source status unknown — claims are unverified
Proximity of the Superconducting Dome and the Quantum Critical Point in the Two-Dimensional Hubbard Model
similarity 0.88S.-X. Yang et al.
Source status unknown — claims are unverified