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The non-equilibrium Bose-Einstein condensation phase transition in microcavity polariton systems

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Several recent experiments have provided evidence for the appearance of macroscopic coherence in polaritonic systems with a spontaneous symmetry breaking mechanism which is the non-equilibrium analog of the Bose-Einstein condensation phase transtion.

In this seminar, we shall review our theoretical results on several aspects of this non-equilibrium phase transition, and we shall try to evidentiate analogies and differences from the usual BEC at equilibrium.

Some among the principal aspects of the transition will be addressed, such as its order, the behaviour of the coherence functions around the critical point, the shape of the condensate in real and momentum space, the diffusive nature of the Goldstone mode, and the quasi-condensation issues in reduced dimensionalities.

Experimental schemes able to probe all these features with current semiconductor optics set-ups will be discussed and comparison will be made with available experimental data.

This talk is part of the Irregular seminars in TCM series.

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