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Title: Photoluminescence of a quantum-dot molecule

The coherent coupling of quantum dots is a sensitive indicator of the energy and phase relaxation processes taking place in the nanostructure components. We formulate a theory of low-temperature, stationary photoluminescence from a quantum-dot molecule composed of two spherical quantum dots whose electronic subsystems are resonantly coupled via the Coulomb interaction. We show that the coupling leads to the hybridization of the first excited states of the quantum dots, manifesting itself as a pair of photoluminescence peaks with intensities and spectral positions strongly dependent on the geometric, material, and relaxation parameters of the quantum-dot molecule. These parameters are explicitly contained in the analytical expression for the photoluminescence differential cross section derived in the paper. The developed theory and expression obtained are essential in interpreting and analyzing spectroscopic data on the secondary emission of coherently coupled quantum systems.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ; ; ;  [4] ;  [6] ;  [3]
  1. Max Planck Institute of Quantum Optics, Hans-Kopfermann-Stra├če 1, D-85748 Garching (Germany)
  2. Monash University, Clayton Campus, Victoria 3800 (Australia)
  3. (Russian Federation)
  4. ITMO University, 197101 Saint Petersburg (Russian Federation)
  5. (Australia)
  6. School of Chemistry and CRANN Institute, Trinity College, Dublin, Dublin 2 (Ireland)
Publication Date:
OSTI Identifier:
22399215
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 1; Other Information: (c) 2015 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; 74 ATOMIC AND MOLECULAR PHYSICS; COULOMB FIELD; COUPLING; DIFFERENTIAL CROSS SECTIONS; EXCITED STATES; MOLECULES; PHOTOLUMINESCENCE; QUANTUM DOTS; QUANTUM SYSTEMS; RELAXATION; SECONDARY EMISSION