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Please use this identifier to cite or link to this item: http://hdl.handle.net/2014/38969

Title: Study of alloy disorder in quantum dots through multi-million atom simulations
Authors: Kilmeck, Gerhard
Oyafuso, Fabiano
Boykin, T. B.
Bowen, R. C.
von Allmen, Paul A.
Keywords: quantum dots
boundary condition
tight binding
linewidth
alloy
disorder
Issue Date: 23-Feb-2003
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2003.
Citation: Nanotech 2003, The Nanotechnology Conference and Trade Show, San Francisco, California, February 23-27, 2003.
Abstract: A tight binding model which includes s, p, d, s orbitals is used to examine the electronic structures of an ensemble of dome-shaped In0.6 Ga0.4 As quantum dots. Given ensembles of identically sized quantum dots, variations in composition and configuration yield a linewidth broadening of less than 0.35 meV, much smaller than the total broadening determined from photoluminescence experiments. It is also found that the computed disorder-induced broadening is very sensitive to the applied boundary conditions, so that care must be taken to ensure proper convergence of the numerical results. Examination of local eigenenergies as functions of position shows similar convergence problems and indicates that an inaccurate resolution of the equilibrium atomic positions due to truncation of the simulation domain may be the source of the slow ground state convergence
URI: http://hdl.handle.net/2014/38969
Appears in Collections:JPL TRS 1992+

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