Quantum treatment of the Bose-Einstein condensation in non-equilibrium systems

H. Flayac, Ivan Savenko, Mikko Möttönen, Tapio Ala-Nissila

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We develop a fully quantum-mechanical approach, based on stochastic trajectories, for an incoherently pumped system of interacting bosons in contact with a thermal reservoir. It enables a complete characterization of coherence in such a multimode system. We apply our model to microcavity exciton polaritons interacting with acoustic phonons and observe the formation of a macroscopic occupation in the lowest-energy mode accompanied by the simultaneous establishment of temporal and spatial coherence. We describe the transition from thermal to coherent statistics together with the expected emergence of an off-diagonal long-range order.
Original languageEnglish
Article number115117
Pages (from-to)1-8
JournalPhysical Review B
Issue number11
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed


  • Bose-Einstein condensation
  • exciton polaritons
  • non-equilibrium dynamics
  • quantum jump
  • quantum transport
  • spatial coherence
  • stochastic wave function
  • temporal coherence

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