BCS-BEC crossover and the disappearance of FFLO-correlations in a spin-imbalanced, one-dimensional Fermi gas
| Autor: | Heidrich-Meisner, F., Feiguin, A. E., Schollwoeck, U., Zwerger, W. |
|---|---|
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 81, 023629 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.81.023629 |
| Popis: | We present a numerical study of the one-dimensional BCS-BEC crossover of a spin-imbalanced Fermi gas. The crossover is described by the Bose-Fermi resonance model in a real space representation. Our main interest is in the behavior of the pair correlations, which, in the BCS limit, are of the Fulde-Ferrell-Larkin-Ovchinnikov type, while in the BEC limit, a superfluid of diatomic molecules forms that exhibits quasi-condensation at zero momentum. We use the density matrix renormalization group method to compute the phase diagram as a function of the detuning of the molecular level and the polarization. As a main result, we show that FFLO-like correlations disappear well below full polarization close to the resonance. The critical polarization depends on both the detuning and the filling. Comment: 13 pages, 21 eps figures, final version, minor revisions, additional references |
| Databáze: | arXiv |
| Externí odkaz: |
|