DocumentCode :
1814992
Title :
Photoluminescence from an ensemble of self-assembled quantum dots: cooperative effects
Author :
Raikh, M.E. ; Shahbazyan, T.V.
Author_Institution :
Dept. of Phys., Utah Univ., Salt Lake City, UT, USA
fYear :
2001
fDate :
11-11 May 2001
Firstpage :
6
Abstract :
Summary form only given. Optical properties of self-assembled quantum dots (SAQD) have attracted much interest during recent years. With a typical size of the order of the Bohr radius, SAQD´s are essentially zero-dimensional objects sustaining only a few excitonic states. Given a high in-plane density, 10/sup 10/-10/sup 12/ cm/sup -2/, an array of SAQD can be viewed as a 2D system of artificial atoms with a narrow distribution of excitation energies. Recent photoluminescence (PL) experiments revealed a rather intricate structure of the PL spectrum collected from small sampling areas. Here we point out that these features of the spectrum may have a natural explanation in terms of cooperative emission from a system of SAQD. We demonstrate that the interplay between QD´s coupling via the radiation field and the disorder in their excitation energies leads to a characteristic fine structure in the emission spectrum.
Keywords :
mesoscopic systems; photoluminescence; quantum dots; self-assembly; superradiance; 2D system; Bohr radius; SAQD array; artificial atoms; characteristic fine structure; cooperative effects; cooperative emission; coupling; disorder; excitation energies; excitonic states; high in-plane density; mesoscopic regimes; optical properties; photoluminescence; radiation field; self-assembled quantum dot ensemble; superradiant coupling; zero-dimensional objects; Astronomy; Cities and towns; Dark states; Hydrogen; Laboratories; Photoluminescence; Physics; Quantum dots; Sampling methods; US Department of Transportation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2001. QELS '01. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-663-X
Type :
conf
DOI :
10.1109/QELS.2001.961774
Filename :
961774
Link To Document :
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