Quantum phase transition in an atomic Bose gas with a Feshbach resonance
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cond-mat.supr-con
cond-mat.str-el
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phaseatomicquantumtransitionbosebose-einsteincondensatefeshbach
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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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