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Search Publications by: Garnett W. Bryant (Fed)

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Displaying 126 - 150 of 338

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

Light Scattering in Gold Nanorings

November 1, 2004
Author(s)
Javier Aizpurua, L A. Blanco, P Hanarp, D S. Sutherland, M Kall, Garnett W. Bryant, F J. de Abajo
The optical response of gold nanoparticles of disk-like and ring-like shape is studied by analyzing their extinctioncross section in the visible and near infrared regions. A strong dependence of the excitation modes on the actual geometry of the

Optical Excitation and Absorption Spectra of C 50 Cl 10

August 1, 2004
Author(s)
Rui-Hua Xie, Garnett W. Bryant, J Cheung, V H. Smith, J Zhao
Recent experiment has synthesized C 50Cl 10 [S.Y. Xie et al., Science 304, 699 (2004)] in a large quantity capturing the labile fullerene C 50. In this Communication, we report ab initio calculations on the optical excitation and absorption spectra of C

Tuning Spectral Properties of Fullerenes by Substitutional Doping

May 1, 2004
Author(s)
Rui-Hua Xie, Garnett W. Bryant, G Sun, T Kar, Z Chen, V H. Smith, Y Araki, N Tagmatarchis, H Shinohara, O Ito
We propose a substitutional doping approach to achieve tunable optical properties from fullerenes. Taking Cd60 as an example and using time-dependent density functional theory, we compute the absorption spectra of heterofullerenes Cd60-dn-dm-NdnBdm, and