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Quantum gas of reactive molecules: evaporation, collision resonance, long lifetime

Friday August 28, 2020
1:00 pm

 Presenter:  Jun Ye, JILA
 Series:  CQuIC Seminars
 Abstract:  A VIRTUAL AMO SEMINAR presented in a Zoom meeting vetted by CQuIC. See https://sites.google.com/stanford.edu/virtual-amo-seminar/schedule for the meeting link. The preparation of a degenerate Fermi gas of polar molecules sets the stage to explore novel many-body physics. We apply precisely controlled electric fields to turn on elastic dipolar interactions by orders of magnitude while suppressing reactive losses. Efficient dipolar evaporation leads to the onset of quantum degeneracy in an array of two-dimensional optical traps. When the electric field is used to tune excited molecular states into degeneracy with the scattering threshold, we observe sharp collision resonances that give rise to three orders-of-magnitude modulation of the chemical reaction rate. Using this resonant shielding, we realize a long lifetime of polar molecular gas at very high electric fields.
 Host:  Ivan Deutsch
 Location:  Zoom

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