Quantum phase transition in an atomic Bose gas with a Feshbach resonance

Details Quantum phase transition in an atomic Bose gas with a Feshbach resonance Quantum phase transition in an atomic Bose gas with a Feshbach resonance

2003-12-18

arxiv.org/abs/cond-mat/0312446v1

Physical Review Letters 93, 020405 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.93.020405

We show that in an atomic Bose gas near a Feshbach resonance a quantum phase transition occurs between a phase with only a molecular Bose-Einstein condensate and a phase with both an atomic and a molecular Bose-Einstein condensate. We show that the transition is characterized by an Ising order parameter. We also determine the phase diagram of the gas as a function of magnetic field and temperature: the quantum critical point extends into a line of finite temperature Ising transitions.

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