BCS-BEC crossover on the two-dimensional honeycomb lattice
Abstract
The attractive Hubbard model on the honeycomb lattice exhibits, at half-filling, a quantum critical point (QCP) between a semimetal with massless Dirac fermions and an s-wave superconductor (SC). We study the BCS-BEC crossover in this model away from half-filling at zero temperature and show that the appropriately defined crossover line (in the interaction-density plane) passes through the QCP at half-filling. For a range of densities around half-filling, the ``underlying Fermi surface'' of the SC, defined as the momentum space locus of minimum energy quasiparticle excitations, encloses an area which evolves nonmonotonically with interactions. We also study fluctuations in the SC and the semimetal, and show the emergence of an undamped Leggett mode deep in the SC. We consider possible implications for experiments on ultracold atoms and high temperature SCs.
Cite
@article{arxiv.cond-mat/0606470,
title = {BCS-BEC crossover on the two-dimensional honeycomb lattice},
author = {Erhai Zhao and Arun Paramekanti},
journal= {arXiv preprint arXiv:cond-mat/0606470},
year = {2009}
}
Comments
Revised - added section on the Fermi surface evolution, corrected error in superfluid density, added possible implications for cuprates