Superfludity and phase transitions in a resonant Bose gas

Published

October 1, 2008

Author(s)

Leo Radzihovsky, Peter B. Weichman, Jae Park

Abstract

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.

Citation

Annals of Physics

Volume

323

Issue

10

Pub Type

Journals

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Keywords

BCS, BEC, Feshbach, Squeezing, Superfluid

Citation

Radzihovsky, L. , Weichman, P. and Park, J. (2008), Superfludity and phase transitions in a resonant Bose gas, Annals of Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32827 (Accessed October 11, 2025)