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Title: Confocal shift interferometry of coherent emission from trapped dipolar excitons

We introduce a confocal shift-interferometer based on optical fibers. The presented spectroscopy allows measuring coherence maps of luminescent samples with a high spatial resolution even at cryogenic temperatures. We apply the spectroscopy onto electrostatically trapped, dipolar excitons in a semiconductor double quantum well. We find that the measured spatial coherence length of the excitonic emission coincides with the point spread function of the confocal setup. The results are consistent with a temporal coherence of the excitonic emission down to temperatures of 250 mK.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [3] ; ;  [5] ;  [5] ;  [3] ; ;  [1] ;  [2] ;
  1. Walter Schottky Institut and Physik-Department, Am Coulombwall 4a, Technische Universität München, D-85748 Garching (Germany)
  2. (NIM), Schellingstr. 4, 80799 München (Germany)
  3. (Germany)
  4. Nanosystems Initiative Munich (NIM), Schellingstr. 4, 80799 München (Germany)
  5. Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
22395512
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COHERENCE LENGTH; EMISSION SPECTROSCOPY; EXCITONS; INTERFEROMETRY; LUMINESCENCE; OPTICAL FIBERS; QUANTUM WELLS; SEMICONDUCTOR MATERIALS; SPATIAL RESOLUTION; TEMPERATURE RANGE 0000-0013 K; TRAPPING