Group seminar at MPQ and Zoom: Many-body theory on microwave shielded polar molecules

Prof Tao Shi, Institute of Theoretical Physics, CAS, China
Group seminar at MPQ lecture hall and Zoom
Monday, 18 November, 2:00pm (MEZ)

We show that the effective interaction potential between microwave-shielded polar molecules consists of an anisotropic van der Waals-like shielding core and a modified dipolar interaction. This effective potential is validated by comparing its scattering cross-sections with those calculated using intermolecular potential involving all interaction channels. It is shown that a scattering resonance can be induced under microwave fields and a field-link tetramer bound state emerges. With the effective potential, we further study the Bardeen-Cooper-Schrieffer pairing and Bose-Einstein condensations in microwave-shielded molecular gas. We show the fermionic superfluid critical temperature drastically enhanced near the resonance and a formation of self-bound droplets with reduced condensate fraction resembling a magnified Helium 4.