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Superfludity and phase transitions in a resonant Bose gas



Leo Radzihovsky, Peter B. Weichman, Jae Park


The atomic Bose gas is studied across a Feshbach resonance, mapping out its phase diagram, and computing its thermodynamics and excitation spectra. It is shown that such a degenerate gas admits two distinct atomic and molecular superfluid phases, with the latter distinguished by the absence of atomic off-diagonal long-range order, gapped atomic excitations, and deconfined atomic $\pi$-vortices. The properties of the molecular superfluid are explored, and it is shown that across a Feshbach resonance it undergoes a quantum Ising transition to the atomic superfluid, where both atoms and molecules are condensed. In addition to its distinct thermodynamic signatures and deconfined half-vortices, in a trap a molecular superfluid should be identifiable by the absence of an atomic condensate peak and the presence of a molecular one.
Annals of Physics


BCS, BEC, Feshbach, Squeezing, Superfluid


Radzihovsky, L. , Weichman, P. and Park, J. (2008), Superfludity and phase transitions in a resonant Bose gas, Annals of Physics, [online], (Accessed April 14, 2024)
Created September 30, 2008, Updated October 12, 2021