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Search Publications by: Garnett W. Bryant (Fed)

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Displaying 51 - 75 of 176

Comparison of the Sensitivity and Image Contrast in Spontaneous Raman and Coherent Stokes Raman Scattering Microscopy of Geometry Controlled Samples

February 9, 2011
Author(s)
Hyun M. Kim, Chris A. Michaels, Garnett W. Bryant, Stephan J. Stranick
We experimentally compare the performance and contrast differences between spontaneous and coherent Stokes Raman scattering microscopy. We demonstrate the differences on a series of geometry controlled samples that range in complexity from a point (array

Effect of Surface Modes on Photon Propagation through Dielectric Bandgaps

October 28, 2009
Author(s)
Natalia Malkova, Sergey V. Polyakov, Alan L. Migdall, Garnett W. Bryant
We investigate the Hartman saturation effect of photons traveling through barriers created by bandgaps of multilayer stacks. In particular, we investigate theoretically the recently observed jumps in photon transversal times due to adding a single layer

Comment on 'Laterally Squeezed Excitonic Wave Function in Quantum Wires'

October 16, 2008
Author(s)
Garnett W. Bryant, Y B. Band, Paul S. Julienne
Recent magnetophotoluminescence data on T-shaped quantum wires is reinterpreted based on a detailed theory of magnetoexcitons in T-shaped quantum wires. We show that the previous analysis greatly overestimates exciton squeezing in T-shaped wires.

Comment on Intrinsic Gap States in Semiconductor Nanocrystals

October 16, 2008
Author(s)
W Jaskolski, R -. Oszwaldowski, Garnett W. Bryant
We comment on the paper Intrinsic Gap States in Semiconductor Nanocrystals. We show that the predicted gap states are nanphysical and should not be used to interpret data.

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

Intrinsic Surface States in Semiconductor Nanocrystals: HgS Quantum Dots

March 23, 2005
Author(s)
James S. Sims, Garnett W. Bryant, Howard Hung
Confined states in typical nanocrystals are localized to the dot interior. Surface states are extrinsic states localized at unsaturated dangling bonds or surface defects. We show that intrinsic surface states occur in nanocrystals made from negative gap
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