Evolution of fermion pairing from three to two dimensions

Ariel T. Sommer, Lawrence W. Cheuk, Mark J.H. Ku, Waseem S. Bakr, Martin W. Zwierlein

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166 Scopus citations


We follow the evolution of fermion pairing in the dimensional crossover from three-dimensional to two-dimensional as a strongly interacting Fermi gas of Li6 atoms becomes confined to a stack of two-dimensional layers formed by a one-dimensional optical lattice. Decreasing the dimensionality leads to the opening of a gap in radio-frequency spectra, even on the Bardeen-Cooper- Schrieffer side of a Feshbach resonance. The measured binding energy of fermion pairs closely follows the theoretical two-body binding energy and, in the two-dimensional limit, the zero-temperature mean-field Bose-Einstein- condensation to Bardeen-Cooper-Schrieffer crossover theory.

Original languageEnglish (US)
Article number045302
JournalPhysical review letters
Issue number4
StatePublished - Jan 23 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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