Effective Field Theory for Atom-Molecule Systems II: Stationary Solutions and Bogoliubov Excitations in Atom-Molecule Systems

Autor:	Sahlberg, Catarina E, Gardiner, C W
Rok vydání:	2011
Předmět:	Physics - Atomic and Molecular Clusters Condensed Matter - Other Condensed Matter
Druh dokumentu:	Working Paper
Popis:	We formulate the basic theoretical methods for Bose-Einstein Condensation of atoms close to a Feshbach resonance, in which the tunable scattering length of the atoms is described using a system of coupled atom and molecule fields. These include the Thomas-Fermi description of the condensate profile, the c-field equations, and the Bogoliubov-de Gennes equations, and the Bogoliubov excitation spectrum for a homogenous condensed system. We apply this formalism to the special case of Bragg scattering from a uniform condensate, and find that for moderate and large scattering lengths, there is a dramatic difference in the shift of the peak of the Bragg spectra, compared to that based on a structureless atom model. The result is compatible with the experimental results of Papp et al. [S. B. Papp et al., Phys. Rev. Lett., 101(13):135301, Sep 2008]. Comment: 17 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1109.2971 Zobrazit plný text záznamu View this record from Arxiv