Laser-induced collective excitations in a two-component Fermi gas
arXiv:cond-mat/0202394 · doi:10.1103/PhysRevA.66.033601
Abstract
We consider the linear density response of a two-component (superfluid) Fermi gas of atoms when the perturbation is caused by laser light. We show that various types of laser excitation schemes can be transformed into linear density perturbations, however, a Bragg spectroscopy scheme is needed for transferring energy and momentum into a collective mode. This makes other types of laser probing schemes insensitive for collective excitations and therefore well suited for the detection of the superfluid order parameter. We show that for the special case when laser light is coupled between the two components of the Fermi gas, density response is always absent in a homogeneous system.
6 pages, no figures
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Cited by in corpus (10)
- Dynamic spin response of a strongly interacting Fermi gas
- Physics of ultracold Fermi gases revealed by spectroscopies
- Nonlinear Lattice Dynamics of Bose-Einstein Condensates
- Bragg scattering of Cooper pairs in an ultra-cold Fermi gas
- Interior gap superfluidity in a two-component Fermi gas of atoms
- Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate
- Light scattering in Cooper-paired Fermi atoms
- Density response of a trapped Fermi gas: a crossover from the pair vibration mode to the Goldstone mode
- Collective dynamics of fermion clouds in cigar-shaped traps
- Finite temperature effects in light scattering off Cooper-paired Fermi atoms