Excitations in a Nonequilibrium Bose-Einstein Condensate of Exciton Polaritons

We develop a mean-field theory of the dynamics of a nonequilibrium Bose-Einstein condensate of exciton polaritons in a semiconductor microcavity. The spectrum of elementary excitations around the stationary state is analytically studied by means of a generalized Gross-Pitaevskii equation. A diffusive behavior of the Goldstone mode is found in the spatially homogeneous case and new features are predicted for the Josephson effect in a two-well geometry.

• CE
  Centre Elile Borel, Institut Henri-Poincaré
• FW
  Fonds Wetenschappelijk Onderzoek
• CN
  Centre National de la Recherche Scientifique
• UA
  Universiteit Antwerpen
• VR
  Vlaamse regering