title: Penrose-Onsager criterion validation in a one-dimensional polariton condensate.
abstract: We perform quantum tomography on one-dimensional polariton condensates, spontaneously occurring in linear disorder valleys in a CdTe planar microcavity sample. By the use of optical interferometric techniques, we determine the first-order coherence function and the amplitude and phase of the order parameter of the condensate, providing a full reconstruction of the single particle density matrix for the polariton system. The experimental data are used as input to theoretically test the consistency of the Penrose-Onsager criterion for Bose-Einstein condensation in the framework of nonequilibrium polariton condensates. The results confirm the pertinence and validity of the criterion for a nonequilibrium condensed gas.
authors.affiliation: Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland. francesco.manni@epfl.ch
authors.forename: F
authors.initials: F
authors.lastname: Manni
authors.forename: K G
authors.initials: KG
authors.lastname: Lagoudakis
authors.forename: R
authors.initials: R
authors.lastname: André
authors.forename: M
authors.initials: M
authors.lastname: Wouters
authors.forename: B
authors.initials: B
authors.lastname: Deveaud