Hyoungsoon Choi: Quantized Vortices in Exciton-Polariton Condensate

Title: Quantized Vortices in Exciton-Polariton Condensate Abstract: Despite their short lifetime in comparison to thermalization time, exciton-polaritons, quasiparticles formed inside a microcavity-quantum-well structure, are found to condense into their ground state, much like a Bose-Einstein condensate (BEC). Whether one can call such exciton-polariton condensate, an intrinsically non-equilibrium condensate, a BEC is debatable, but they do reveal unique properties of a superfluid including formation of quantized vortices. In this talk, I will describe a relatively simple technique for creating these quantized vortices in exciton-polariton condensate [1] and show time resolved dynamics of the vortex formation and extinction [2]. The observed effect is well-described by the driven-dissipative Gross-Pitaevskii equation coupled with pumping reservoirs. [1] M. -S. Kwon and B. Y. Oh et al., Phys. Rev. Lett. 122, 045302 (2019). [2] D. Choi and M. Park et al., Phys. Rev. B 105, L060502 (2022).