Angular distribution of photoluminescence as a probe of Bose condensation of trapped excitons

Jonathan Mark James Keeling, L S Levitov, P B Littlewood

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Recent experiments on two-dimensional exciton systems have shown that excitons collect in shallow in-plane traps. We find that Bose condensation in a trap results in a dramatic change of the exciton photoluminescence (PL) angular distribution. The long-range coherence of the condensed state gives rise to a sharply focused peak of radiation in the direction normal to the plane. By comparing the PL profile with and without Bose condensation, we provide a simple diagnostic for the existence of a Bose condensate. The PL peak has strong temperature dependence due to the thermal order parameter phase fluctuations across the system. The angular PL distribution can also be used for imaging vortices in the trapped condensate. Vortex phase spatial variation leads to destructive interference of PL radiation in certain directions, creating nodes in the PL distribution that imprint the vortex configuration.

Original languageEnglish
Pages (from-to)176402
Number of pages4
JournalPhysical Review Letters
Volume92
Issue number17
DOIs
Publication statusPublished - 30 Apr 2004

Keywords

  • COUPLED QUANTUM-WELLS
  • EINSTEIN CONDENSATION
  • POTENTIAL TRAPS
  • NOBEL LECTURE
  • SYSTEM
  • GAS

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