Issue |
EPL
Volume 96, Number 6, December 2011
|
|
---|---|---|
Article Number | 66004 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
DOI | https://doi.org/10.1209/0295-5075/96/66004 | |
Published online | 06 December 2011 |
Dynamical spin-flip susceptibility for a strongly interacting ultracold Fermi gas
1
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
a
anna.minguzzi@grenoble.cnrs.fr
Received:
30
May
2011
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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