Dielectric environment mediated quantum screening of one dimensional electron gas

Details Dielectric environment mediated quantum screening of one dimensional electron gas Dielectric environment mediated quantum screening of one dimensional electron gas

2011-02-15

arxiv.org/abs/1102.3110v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

Relaxing the assumption of "infinite and homogenous background" the dielectric response function of one-dimensional (1D) semiconducting nanowires embedded in a dielectric environment is calculated. It is shown that high-k (higher than semiconductor dielectric constant) dielectric environment reduces the screening by the free carriers inside the nanostructure whereas, low dielectric environment increases the Coulombic interaction between free carriers and enhances the strength of screening function. In long wavelength limit, dielectric screening and collective excitation of electron gas are found to be solely determined by the environment instead of the semiconductor. Behavior of static dielectric function is particularly addressed at a specific wavevector q=2k_F; a wavevector ubiquitously appears in charge transport in nanostructures

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