Dissipation in a polariton superfluid beyond the Landau criterion
ORAL
Abstract
Polariton superfluids have a finite lifetime and are often created under a constant optical pumping in a semiconductor microcavity. The balance between the gain and loss of the particles in the superfluid generates a steady-state current. In this steady-state condition, the polariton superfluid experiences energy damping and is slowed down due to the collisions with the particles in a stationary reservoir that is comprised of free thermal electrons. When the reservoir is in relative motion with respect to the superfluid these collisions give rise to either an upward or a downward shift in the chemical potential of the superfluid depending on the direction of the relative motion. This phenomenon has been observed in recent experiments described in https://arxiv.org/abs/1808.07866.
*The work at Pittsburgh was funded by the Army Research Office (W911NF-15-1-0466) and by the National Science Foundation (grant no. DMR-2004570). This research was supported in part by the University of Pittsburgh Center for ResearchComputing through the resources provided. The work of sample fabrication at Princeton was funded in part by the Gordon and Betty Moore Foundation (GBMF-4420) and by the National Science Foundation MRSECprogram through the Princeton Center for Complex Materials (DMR-0819860).
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Publication: https://arxiv.org/abs/1808.07866
Presenters
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Shouvik Mukherjee
- University of Maryland, College Park
- University of Pittsburgh