| Autor: |
Bouadim, K., Enjalran, M., Hebert, F., Batrouni, G. G., Scalettar, R. T. |
| Rok vydání: |
2007 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B77, 014516 (2008) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.77.014516 |
| Popis: |
The `dynamic' Hubbard Hamiltonian describes interacting fermions on a lattice whose on-site repulsion is modulated by a coupling to a fluctuating bosonic field. We investigate one such model, introduced by Hirsch, using the determinant Quantum Monte Carlo method. Our key result is that the extended s-wave pairing vertex, repulsive in the usual static Hubbard model, becomes attractive as the coupling to the fluctuating Bose field increases. The sign problem prevents us from exploring a low enough temperature to see if a superconducting transition occurs. We also observe a stabilization of antiferromagnetic correlations and the Mott gap near half-filling, and a near linear behavior of the energy as a function of particle density which indicates a tendency toward phase separation. |
| Databáze: |
arXiv |
| Externí odkaz: |
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