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Title: Double quantum dot in a quantum dash: Optical properties

We study the optical properties of highly elongated, highly flattened quantum dot structures, also referred to as quantum dashes, characterized by the presence of two trapping centers located along the structure. Such a system can exhibit some of the properties characteristic for double quantum dots. We show that sub- and super-radiant states can form for certain quantum dash geometries, which is manifested by a pronounced transfer of intensity between spectral lines, accompanied by the appearance of strong electron-hole correlations. We also compare exciton absorption spectra and polarization properties of a system with a single and double trapping center and show how the geometry of multiple trapping centers influences the optical properties of the system. We show that for a broad range of trapping geometries the relative absorption intensity of the ground state is larger than that of the lowest excited states, contrary to the quantum dash systems characterized by a single trapping center. Thus, optical properties of these structures are determined by fine details of their morphology.
Authors:
;  [1] ;  [2]
  1. Institute of Physics, Wrocław University of Technology, 50-370 Wrocław (Poland)
  2. Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, 48149 Münster (Germany)
Publication Date:
OSTI Identifier:
22257765
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 18; Other Information: (c) 2013 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; ABSORPTION SPECTRA; EXCITED STATES; GROUND STATES; HOLES; MORPHOLOGY; OPTICAL PROPERTIES; POLARIZATION; QUANTUM DOTS; TRAPPING