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Proceedings Paper

A negative dielectric constant in nano-particle materials under an electric field at very low frequencies
Author(s): C. W. Chu; F. Chen; J. Shulman; S. Tsui; Y. Y. Xue; W. Wen; P. Sheng
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Paper Abstract

The significance of a negative dielectric constant has long been recognized. We report here the observation of a field-induced large negative dielectric constant of aggregates of oxide nano-particles at frequencies below ~ 1 Hz at room temperature. The accompanying induced charge detected opposes the electric field applied in the field-induced negative dielectric constant state. A possible collective effect in the nano-particle aggregates is proposed to account for the observations. Materials with a negative dielectric constant are expected to provide an attraction between similar charges and unusual scattering to electromagnetic waves with possible profound implications for high temperature superconductivity and communications.

Paper Details

Date Published: 5 October 2005
PDF: 10 pages
Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59320X (5 October 2005); doi: 10.1117/12.626267
Show Author Affiliations
C. W. Chu, Univ. of Houston (United States)
Hong Kong Univ. of Science and Technology (Hong Kong China)
Lawrence Berkeley National Lab. (United States)
F. Chen, Univ. of Houston (United States)
J. Shulman, Univ. of Houston (United States)
S. Tsui, Univ. of Houston (United States)
Y. Y. Xue, Univ. of Houston (United States)
W. Wen, Hong Kong Univ. of Science and Technology (Hong Kong China)
P. Sheng, Hong Kong Univ. of Science and Technology (Hong Kong China)

Published in SPIE Proceedings Vol. 5932:
Strongly Correlated Electron Materials: Physics and Nanoengineering
Ivan Bozovic; Davor Pavuna, Editor(s)

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