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Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
C. Chin, M. Bartenstein A. Altmeyer, S. Riedl +3
We study fermionic pairing in an ultracold two-component gas of Li atoms by observing an energy gap in the radio-frequency excitation spectra. With control of the two-body inte…
Tuning the scattering length with an optically induced Feshbach resonance
M. Theis, G. Thalhammer, K. Winkler +4
We demonstrate optical tuning of the scattering length in a Bose-Einstein condensate as predicted by Fedichev {\em et al.} [Phys. Rev. Lett. {\bf 77}, 2913 (1996)]. In our experime…
Collective excitations of a degenerate gas at the BEC-BCS crossover
M. Bartenstein, A. Altmeyer, S. Riedl +4
We study collective excitation modes of a fermionic gas of Li atoms in the BEC-BCS crossover regime. While measurements of the axial compression mode in the cigar-shaped trap c…
Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
M. Bartenstein, A. Altmeyer, S. Riedl +4
We demonstrate a reversible conversion of a Li2 molecular Bose-Einstein condensate to a degenerate Fermi gas of atoms by adiabatically crossing a Feshbach resonance. By optical in…