Dielectric confinement influenced screened Coulomb potential for a semiconductor quantum wire

2nd International Symposium "Optics and its Applications"

Aharonyan, K.H.^1,2 ; Margaryan, N.B.^1

National Polytechnic University of Armenia, Armenia^1

Armenian State Pedagogical University after Khachatur Abovyan, Armenia^2

关键词: Analytical expressions;    Cylindrical quantum wires;    Dielectric confinement;    Effective interactions;    Interaction potentials;    Low-dielectric properties;    Quasi-one dimensional;    Screened Coulomb potentials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/672/1/012009/pdf
DOI  :  10.1088/1742-6596/672/1/012009

来源: IOP

【 摘 要 】

A formalism of the Thomas-Fermi method has been applied for studying the screening effect due to quasi-one-dimensional electron gas in a semiconductor cylindrical quantum wire embedded in the barrier environment. With taking into account of strongly low dielectric properties of the barrier material, an applicability of the quantum wire effective interaction potential of the confined charge carriers has been revealed. Both screened quasi- one-dimensional interaction potential and effective screening length analytical expressions are derived in the first time. It is shown that in the long wavelength moderate limit dielectric confinement effect enhances strength of the screening potential depending on the both radius of the wire and effective screening length, whereas in the long wavelength strong limit the screening potential solely is determined by barrier environment dielectric properties.