Renormalized atomic interaction and quadrupole excitations of cold Fermi gas near Feshbach resonance

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We present a model space particle-hole Green's function calculation for the quadrupole excitations of cold Fermi gas near Feshbach resonance using a simple model where atoms are confined in a harmonic oscillator potential. Both the Tamm-Dancoff and random phase approximations are employed. By summing up exactly the ladder diagrams between a pair of interacting atoms to all orders, we obtain a renormalized atomic interaction which has well defined and identical limits as the scattering length tends to $\pm \infty$. The experimentally observed abrupt rise in the excitation spectrum and its associated large decay width are satisfactorily reproduced by our calculation.
4 pages, 3 figures

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http://salesiana.dossiersoluciones.com/handle/123456789/116011

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0609290
 http://arxiv.org/abs/cond-mat/0609290

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arXiv