Optical properties and diamagnetic susceptibility of a hexagonal quantum dot: impurity effect

Abstract

In this work, a hexagonal quantum dot (HQD) with hydrogenic donor impurity was considered. We have first employed the finite element method (FEM) to determine energy eigenvalues and eigenstates of the system. Then, we have calculated the binding energy, absorption coefficients (ACs), refractive index changes (RICs), diamagnetic susceptibility, entropy and specific heat of the system under influence of impurity location. It is found that (1) total ACs and RICs show a maximum value at an especial impurity location and the properties have a blue or red shift with changing the impurity position. (2) The influence of impurity position on the electronic, optical and thermodynamic properties of a HQD is considerable. (3) The absolute value of diamagnetic susceptibility with impurity is lower than it without impurity. (4) The specific heat shows a peak structure in the presence of impurity. The peak position of specific heat depends on impurity location and temperature. (5) Entropy is reduced in the presence of impurity.