Determination of the superfluid gap in atomic Fermi gases by quasiparticle spectroscopy.

@article{Schirotzek2008DeterminationOT,
  title={Determination of the superfluid gap in atomic Fermi gases by quasiparticle spectroscopy.},
  author={André Schirotzek and Y. Shin and Christian H. Schunck and Wolfgang Ketterle},
  journal={Physical review letters},
  year={2008},
  volume={101 14},
  pages={
          140403
        }
}
We present majority and minority radio frequency spectra of strongly interacting imbalanced Fermi gases of 6Li. We observed a smooth evolution in the nature of pairing correlations from pairing in the superfluid region to polaron binding in the highly polarized normal region. The imbalance induces quasiparticles in the superfluid region even at very low temperature. This leads to a local bimodal spectral response, which allowed us to determine the superfluid gap Delta and the Hartree energy U. 

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References

SHOWING 1-10 OF 55 REFERENCES
Determination of the fermion pair size in a resonantly interacting superfluid
TLDR
This work realizes a superfluid spin mixture in which such interactions have negligible influence and presents fermion pair dissociation spectra that reveal the underlying pairing correlations, and determines that the spectroscopic pair size in the resonantly interacting gas is 20 per cent smaller than the interparticle spacing.
Phase diagram of a two-component Fermi gas with resonant interactions
TLDR
The phase diagram of a spin-polarized Fermi gas of 6Li atoms at unitarity is presented, experimentally mapping out the superfluid phases versus temperature and density imbalance and the implementation of an in situ ideal gas thermometer provides quantitative tests of theoretical calculations on the stability of resonant superfluidity.
Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas.
TLDR
This study realizes a gedanken experiment of bosons immersed in a Fermi sea of one of their constituents, revealing the composite nature of the bosons.
Determination of the equation of state of a polarized Fermi gas at unitarity
We report on the measurement of the equation of state of a two-component Fermi gas of $^{6}\mathrm{Li}$ atoms with resonant interactions. By analyzing the in situ density distributions of a
APPL
TLDR
A prototype probability package named APPL (A Probability Programming Language) is presented that can be used to manipulate random variables and examples illustrate its use.
Nature
  • R. Rosenfeld
  • Medicine
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Ann
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Nature (London) 451
  • 689
  • 2008
in Ultracold Fermi Gases
  • Proceedings of the International School of Physics ‘‘Enrico Fermi’’ Course CLXIV
  • 2008
Nature 451
  • 689
  • 2008
...
1
2
3
4
5
...