Evolution of pairing from weak to strong coupling on a honeycomb lattice

Details Evolution of pairing from weak to strong coupling on a honeycomb lattice Evolution of pairing from weak to strong coupling on a honeycomb lattice

2009-02-18

arxiv.org/abs/0902.3242v2

Phys. Rev. B 80, 104517 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages

Scientific paper

10.1103/PhysRevB.80.104517

We study the evolution of the pairing from weak to strong coupling on a honeycomb lattice by Quantum Monte Carlo. We show numerical evidence of the BCS-BEC crossover as the coupling strength increases on a honeycomb lattice with small fermi surface by measuring a wide range of observables: double occupancy, spin susceptibility, local pair correlation, and kinetic energy. Although at low energy, the model sustains Dirac fermions, we do not find significant qualitative difference in the BCS-BEC crossover as compared to those with an extended Fermi surface, except at weak coupling, BCS regime.

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