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Title: Determination of lateral size distribution of type-II ZnTe/ZnSe stacked submonolayer quantum dots via spectral analysis of optical signature of the Aharanov-Bohm excitons

For submonolayer quantum dot (QD) based photonic devices, size and density of QDs are critical parameters, the probing of which requires indirect methods. We report the determination of lateral size distribution of type-II ZnTe/ZnSe stacked submonolayer QDs, based on spectral analysis of the optical signature of Aharanov-Bohm (AB) excitons, complemented by photoluminescence studies, secondary-ion mass spectroscopy, and numerical calculations. Numerical calculations are employed to determine the AB transition magnetic field as a function of the type-II QD radius. The study of four samples grown with different tellurium fluxes shows that the lateral size of QDs increases by just 50%, even though tellurium concentration increases 25-fold. Detailed spectral analysis of the emission of the AB exciton shows that the QD radii take on only certain values due to vertical correlation and the stacked nature of the QDs.
Authors:
; ; ;  [1] ;  [2] ;  [1] ; ;  [3] ;  [2] ;  [4] ;  [2] ;  [4] ;  [5]
  1. Department of Physics, Queens College of CUNY, Queens, New York 11367 (United States)
  2. (United States)
  3. The Graduate Center of CUNY, New York, New York 10016 (United States)
  4. National High Magnetic Field Laboratory, Tallahassee, Florida 32310 (United States)
  5. Evans Analytical Group, Sunnyvale, California 94086 (United States)
Publication Date:
OSTI Identifier:
22308183
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AHARONOV-BOHM EFFECT; CORRELATIONS; DISTRIBUTION; EQUIPMENT; EXCITONS; ION MICROPROBE ANALYSIS; MAGNETIC FIELDS; MASS SPECTROSCOPY; PHOTOLUMINESCENCE; QUANTUM DOTS; TELLURIUM; ZINC SELENIDES; ZINC TELLURIDES