SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 22: Focus Session: Emerging Semiconductor Laser Concepts

HL 22.5: Invited Talk

Friday, October 1, 2021, 12:15–12:45, H4

When polariton condensates have dissipations or have no excitons — •Hui Deng — University of Michigan, Ann Arbor, MI USA

Microcavity exciton-polaritons are formed in a semiconductor with strong exciton-photon coupling and low carrier density. They have been widely studied as a weakly interacting boson gas that can form a Bose-Einstein condensation (BEC) like many-body state in a solid. However, the cavity dissipation and fermionic nature of the electrons can lead to phenomena outside the well established framework for quasi-equilibrium polariton condensation. We discuss two such examples. We first discuss the formation of limit cycles with two coupled condensates, as a result of dissipative coupling and polariton nonlinearity. We then look "inside" the polaritons and reveal an electron-hole-photon condensate that share similar spectral properties as a polariton BEC but with a microscopic origin similar to a BCS-state.