Pseudo-gap pairing in ultracold Fermi atoms

Details Pseudo-gap pairing in ultracold Fermi atoms Pseudo-gap pairing in ultracold Fermi atoms

2010-03-08

arxiv.org/abs/1003.1538v2

Phys. Rev. Lett. 104, 240407 (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures; add comparison with the JILA pseudogap measurement (Nature Physics); published version in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.104.240407

The crossover from a BEC (Bose-Einstein condensation) to a BCS (Bardeen-Cooper-Schrieffer) superfluid in dilute gases of ultracold Fermi atoms creates an ideal environment to enrich our knowledge of strongly correlated many-body systems. These experiments are relevant to a wide range of fields from condensed matter to astrophysics. The nature of pairing in strongly interacting Fermi gases can be readily studied, thus aiding our understanding of related problems in high-T_{c} superconductors, whose mechanism is still under debate. These are not well-understood due to the large interaction parameter. Here, we calculate the dynamical properties of a normal, trapped, and strongly correlated Fermi gas, by developing a quantum cluster expansion. In ultra-cold atomic physics one can measure the elementary excitations, using rf or Bragg spectroscopy. Our calculations for the single-particle spectral function agree with the recent measurements, and clearly demonstrate pseudogap pairing in the strongly interacting regime.

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