Dielectric environment mediated quantum screening of one dimensional   electron gas
  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 
Aniruddha Konar, Tian Fang and Debdeep Jena
cond-mat.mes-hall cond-mat.mtrl-sci quant-ph