Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N61: Precision Many Body Physics II: Topology and Strong Correlations
11:30 AM–2:30 PM,
Wednesday, March 8, 2023
Room: Room 418
Sponsoring
Unit:
DCOMP
Chair: Sathwik Bharadwaj, Purdue University
Abstract: N61.00003 : Ballistic transport and persistent circulation in a polariton ring condensate*
12:42 PM–12:54 PM
Presenter:
Qi Yao
(University of Pittsburgh)
Authors:
Qi Yao
(University of Pittsburgh)
Evgeny Sedov
(Westlake University)
Shouvik Mukherjee
(University of Pittsburgh)
Jonathan C Beaumariage
(University of Pittsburgh)
Burcu OZDEN
(Pennsylvania State University)
Hassan A Alnatah
(University of Pittsburgh)
Kenneth W West
(Princeton University)
Loren N Pfeiffer
(Princeton University)
Alexey Kavokin
(Westlake University)
David W Snoke
(University of Pittsburgh)
My experiments focus on polariton ring condensate. One way to create a ring condensate is to etch the top mirror of the cavity to a ring shape, and inject the polariton condensate at one point in the etched ring. The condensate transports ballistically, and forms orbital-like patterns. Although the condensate is in a single energy state, its polarization precesses around the ring, because of a term in the Hamiltonian analogous to the spin-orbit coupling.
Another way to create ring condensate is to use an optical trap. The target-shape pump laser not only generates polaritons but also creates a Mexican hat potential due to exciton-polariton interaction. The ring condensate was observed at the valley of the potential and was not circulating. When a second, pulsed laser (probe) was introduced, the condensate circulated with winding number 1. We can flip the circulation direction by changing the probe position. We also observed that the circulation persists for 13.2ns, which is much longer than the polariton lifetime.
*National Science Foundation (Grant No. DMR-2004570).
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