Volume 96, Number 6, December 2011
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||06 December 2011|
Dynamical spin-flip susceptibility for a strongly interacting ultracold Fermi gas
International School for Advanced Studies (SISSA) - Via Bonomea 265, I-34136 Trieste, Italy, EU
2 Dipartimento di Fisica Galileo Galilei and CNISM, Università di Padova - Via Marzolo 8, I-35122 Padova, Italy, EU
3 Université Grenoble I and CNRS, Laboratoire de Physique et Modélisation, des Milieux Condensés UMR 5493, Maison des Magistères - B.P. 166, F-38042 Grenoble, France, EU
Accepted: 28 October 2011
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.
PACS: 67.85.-d – Ultracold gases, trapped gases / 05.30.Fk – Fermion systems and electron gas / 03.75.-b – Matter waves
© EPLA, 2011
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