Field-induced giant static dielectric constant in nano-particle aggregates at room temperat.pdf
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Field-induced giant static dielectric constant in nano-particle aggregates at room temperat
1
Field-induced giant static dielectric constant in nano-particle
aggregates at room temperature
F. CHEN1, J. SHULMAN1, S. TSUI1, Y. Y. XUE1, W. WEN2, P. SHENG2 and C. W. CHU*1,3,4
1Department of Physics and Texas Center for Superconductivity, University of Houston, 202
Houston Science Center, Houston, Texas 77204-5002
2Department of Physics and Institute of Nano Science and Technology, Hong Kong University of
Science and Technology, Clear Water Bay, Kowloon, Hong Kong
3Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
4Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720
The analogy between magnetism and electricity has long been established by Maxwell in
the 19th century, in spite of their subtle difference. While magnetic materials display
paramagnetism, ferromagnetism, antiferromagnetism, and diamagnetism, only
paraelectricity, ferroelectricity, and antiferrolelectricity have been found in dielectric
materials. The missing ‘diaelectricity’ may be found if there exists a material that has a
dc-polarization opposing the electric field or a negative dielectric susceptibility ε’-1, with
ε’ being the real part of the relative dielectric constant. Both of these properties have been
observed in nano-particle aggregates under a dc electric bias field at room temperature. A
possible collective effect in the nano-particle aggregates is proposed to account for the
observation. ‘Diaelectricity’ implies overscreening by polarization to the external
charges. Materials with a negative static ε’ are expected to provide attraction to similar
charges and unusual scattering to electromagnetic waves with possible profound
implications for high temperature superconductivity and communication.
2
Keywords: negative dielectric constant, negative polarization, diaelectricity, nano-
particles, electrorheology
A negative static dielectric constant, ε’(k,ω), at wave-vector k ≠ 0 and frequency ω = 0,
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