Multistability and condensation of exciton-polaritons below threshold

Jiun Yi Lien, Yueh Nan Chen, Natsuko Ishida, Hong Bin Chen, Chi Chuan Hwang, Franco Nori

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Exciton-polaritons can condense to a macroscopic quantum state through a nonequilibrium process of pumping and decay. In recent experiments, polariton condensates are used to observe, for a short time, nonlinear Josephson phenomena by coupling two condensates. However, it is still not clear how these phenomena are affected by the pumping and decay at long times and how the coupling alters the polariton condensation. Here, we consider a polariton Josephson junction pumped on one side and study its dynamics within the mean-field theory. The Josephson current is found to give rise to multistability of the stationary states, which are sensitive to the initial conditions and incoherent noises. These states can be attributed to either the self-trapping effect or the parity-time (PT) symmetry of the system. These results can be used to explain the emission spectra and the π-phase locking observed in recent experiments. We further predict that the multistability can reduce to the self-trapped state if the PT symmetry is broken. Moreover, the polaritons can condense even below the threshold, exhibiting hysteresis.

Original languageEnglish
Article number024511
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number2
DOIs
Publication statusPublished - 2015 Jan 20

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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