Resonant Superfluidity in an Optical Lattice

Autor:	Titvinidze, I., Snoek, M., Hofstetter, W.
Rok vydání:	2009
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Other Condensed Matter
Zdroj:	New J. Phys. 12 (2010) 065030
Druh dokumentu:	Working Paper
DOI:	10.1088/1367-2630/12/6/065030
Popis:	We study a system of ultracold fermionic Potassium (40K) atoms in a three-dimensional optical lattice in the vicinity of an s-wave Feshbach resonance. Close to resonance, the system is described by a multi-band Bose-Fermi Hubbard Hamiltonian. We derive an effective lowest-band Hamiltonian in which the effect of the higher bands is incorporated by a self-consistent mean-field approximation. The resulting model is solved by means of Generalized Dynamical Mean-Field Theory. In addition to the BEC/BCS crossover we find a phase transition to a fermionic Mott insulator at half filling, induced by the repulsive fermionic background scattering length. We also calculate the critical temperature of the BEC/BCS-state and find it to be minimal at resonance. Comment: 19 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0912.1589 Zobrazit plný text záznamu View this record from Arxiv