Physics at Virginia

"Engineering Long-Range Interactions Between Ultracold Atoms"

Brian J. DeSalvo , Indiana University Bloomington
[Host: Peter Schauss]

Throughout many fields of physics, particle exchange plays an important role in the understanding of long-range interactions. From the exchange of massive bosons yielding the Yukawa potential to the phonon exchange underpinning Cooper pairing in superconductors, such mediated interactions can have profound consequences on the ground state of a many-body system. When a Bose-Einstein condensate (BEC) is immersed in a degenerate Fermi gas, exchange of a particle-hole pair of fermions gives rise to an attractive mediated interaction between bosons. These mediated interactions are analogous to the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism in condensed matter and are expected to give rise to novel magnetic phases and supersolids. In this talk, I will describe how we experimentally realize these mediated interactions in a quantum degenerate mixture of Li and Cs. We show that for suitable conditions, these mediated interactions can become dominant and convert a stable BEC into a train of \Bose-Fermi solitons". In the time remaining, prospects for other methods of engineering long-range interactions in quantum gases will also be discussed.

Atomic Physics Seminar
Monday, April 19, 2021
4:00 PM
Online, Room via Zoom
Note special time.
Note special room.

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Meeting ID: 931 1614 9867
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