Programme

P.16 -- Poster, VCTP-46

Date: Tuesday, 5 October 2021

Time: 08:30 - 10:00

Free-carrier screening in cylindrical quantum wires: Effect of dielectric mismatch and finite confinement potential

Nguyen Nhu Dat

Duy Tan University

The dielectric response function of the electron system in a cylindrical semiconductor quantum wire is derived within the random phase approximation by using the linear response theory in the quantum limit when the only lowest electron subband is assumed to be occupied. The wire is considered in both finite and infinite confinement potential models. The plasmon dispersion is obtained as a root of the dielectric function taking into account the mismatch of dielectric constants of the wire and the barrier materials. The impurity-limited electron mobility of the wire is calculated in the dependence on the ratio of the dielectric constants of the wire and the surroundings, and the wire size. It has been shown that the free-carrier screening is smaller with higher-$\kappa$ dielectric environment, leading to a decrease in electron mobility in contrast to what has been reported in some previous publications.

Presenter: Nguyễn Như Đạt