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Search Publications by: Garnett W. Bryant (Fed)

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Displaying 101 - 125 of 338

Excitions in Quantum-Dot Quantum Well Structures

October 16, 2008
Author(s)
W Jaskolski, Garnett W. Bryant
The energy levels and excitation spectra of multi-shell nanocrystals composed of ZnS and CdS layers are investigated. The calculations are performed both in the 6-band envelope function approximation and in the tight-binding approach. Charge separation of

Purcell and Local-Field Effects in Dielectric Microcavities

October 16, 2008
Author(s)
A Rahmani, Garnett W. Bryant
We present a general, semi-microscopic, self-consistent treatment of spontaneous emission for a two-level atom in a dielectric microcavity with arbitrary shape and size. Lossless and absorbing media are considered. The approach is based on linear-response

Surface Effects on Capped and Uncapped Nanocrystals

October 16, 2008
Author(s)
Garnett W. Bryant, W Jaskolski
Surface effects significantly influence the functionality of semiconductor nanocrystals. A theoretical understanding of these effects requires an atomic-scale description of the surface. We present an atomistic tight-binding theory of the electronic and

Tunable Optical Properties of Icosahedral, Dodecahedral and Tetrahedral Clusters

October 16, 2008
Author(s)
Rui-Hua Xie, Garnett W. Bryant, J Zhao, T Kar, V H. Smith
Using time-dependent density functional theory, we show that the first singlet excitations of a series of icosahedral, dodecahedral and tetrahedral clusters are optically forbidden and that their optical absorption gaps and spectral properties are size-

Accelerating Scientific Discovery through Computation and Visualization III. Tight-binding Wave Functions for Quantum Dots

June 2, 2008
Author(s)
James S. Sims, John G. Hagedorn, Steven G. Satterfield, Terence J. Griffin, William L. George, Howard Hung, John T. Kelso, Thomas M. Olano, Adele P. Peskin, Judith E. Terrill, Garnett W. Bryant, Jose G. Diaz
This is the third in a series of articles that describe, through examples, how the Scientific Applications and Visualization Group (SAVG) at NIST has utilized high performance parallel computing, visualization, and machine learning to accelerate scientific

Electrical breakdown in the microscale: testing the standard theory

December 29, 2006
Author(s)
Emmanouel S. Hourdakis, Garnett W. Bryant, Neil M. Zimmerman
We present breakdown voltage measurement data in air taken with a technique we recently developed. The data suggests that below 10 ?m of electrode separation the dominant effect is field emission of electrons from the electrodes. Analyzing the data in that