Static and Dynamic properties of a Fermi-gas of cooled atoms near a wide Feshbach resonance

Autor:	Sun, Deqiang, Abanov, Ar., Pokrovsky, V. L.
Rok vydání:	2009
Předmět:	Condensed Matter - Other Condensed Matter
Druh dokumentu:	Working Paper
Popis:	We introduce the Global Spin Model to study the static and dynamic properties of the ultracold fermionic gas near the broad Feshbach resonance. We show that the problem of molecular production, in a single-mode approximation, is reduced to the linear Landau-Zener problem for operators. The strong interaction leads to significant renormalization of the gap between adiabatic levels. In contrast to static problem the close vicinity of exact resonance does not play substantial role. Two main physical results of our theory is the high sensitivity of molecular production to the initial value of magnetic field and generation of a large BCS condensate distributed over a broad range of momenta in a wide range of parameters. We calculate the amplitude of the condensate as function of the initial detuning and the rate of the magnetic field sweep. Comment: 10 pages, no figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0902.2178 Zobrazit plný text záznamu View this record from Arxiv