Dynamical spin-flip susceptibility for a strongly interacting ultracold Fermi gas

, and

Published 6 December 2011 Europhysics Letters Association
, , Citation M. Sandri et al 2011 EPL 96 66004 DOI 10.1209/0295-5075/96/66004

0295-5075/96/6/66004

Abstract

The Stoner model predicts that a two-component Fermi gas at increasing repulsive interactions undergoes a ferromagnetic transition. Using the random-phase approximation we study the dynamical properties of the interacting Fermi gas. For an atomic Fermi gas under harmonic confinement we show that the transverse (spin-flip) dynamical susceptibility displays a clear signature of the ferromagnetic phase in a magnon peak emerging from the Stoner particle-hole continuum. The dynamical spin susceptibilities could be experimentally explored via spin-dependent Bragg spectroscopy.

Export citation and abstract BibTeX RIS

10.1209/0295-5075/96/66004