Temperature dependence of the coherence in polariton condensates
arXiv:1710.06292 · doi:10.1103/PhysRevB.97.075442
Abstract
We present a time-resolved experimental study of the temperature effect on the coherence of traveling polariton condensates. The simultaneous detection of their emission both in real- and reciprocal-space allows us to fully monitor the condensates' dynamics. We obtain fringes in reciprocal-space as a result of the interference between polariton wavepackets (WPs) traveling with the same speed. The periodicity of these fringes is inversely proportional to the spatial distance between the interfering WPs. In a similar fashion, we obtain interference fringes in real-space when WPs traveling in opposite directions meet. The visibility of both real- and reciprocal-space interference fringes rapidly decreases with increasing temperature and vanishes. A theoretical description of the phase transition, considering the coexistence of condensed and non-condensed particles, for an out of equilibrium condensate such as ours is still missing. Yet a comparison with theories developed for atomic condensates allows us to infer a critical temperature for the BEC-like transition when the visibility goes to zero.
arXiv comment8 pages, 4 figures
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- Jitter of condensation time and dynamics of spontaneous symmetry breaking in a gas of microcavity polaritons
- Coupling Dynamics and Linear Polarization Phenomena in Codirectional Polariton Waveguide Couplers
- On the remote coherence of polariton condensates in 1D microcavities: a photoluminescence study