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Quench dynamics of a strongly interacting resonant Bose gas

NOV 15, 2013 | 10:30 AM TO 12:00 PM



The Graduate Center
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November 15, 2013: 10:30 AM-12:00 PM




Initiative for the Theoretical Sciences - Quantum condensed matter


Initiative for the Theoretical Sciences (ITS) Quantum condensed matter and information theory seminar

"Quench Dynamics of a Strongly Interacting Resonant Bose Gas."

Guest speaker: Leo Radzihovsky (Univ. of Colorado)
Host: Vadim Oganesyan

After an introductory overview of the ultra-cold atomic gases, I will discuss our recent work on dynamics of a Bose gas following its quench to a strongly interacting regime near a Feshbach resonance. Within a self-consistent Bogoliubov analysis we find that after the initial condensate-quasiparticle Rabi oscillations, at long time scales the gas is characterized by a nonequilibrium steady-state momentum distribution function, with depletion, condensate density and contact that deviate strongly from their corresponding equilibrium values. These are in a qualitative agreement with recent experiments on Rb85. Our analysis also suggests that for sufficiently deep quenches close to the resonance the nonequilibrium state undergoes a phase transition to a fully depleted state, characterized by a vanishing condensate density. 

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