Effects of applied lateral electric field and hydrostatic pressure on the intraband optical transitions in a GaAs / Ga 1 -xAlxAs quantum ring

Abstract

In this paper the simultaneous effects of applied lateral electric field and hydrostatic pressure on the intraband linear optical absorption coefficient have been investigated in a two-dimensional GaAs/Ga1-xAlxAs single quantum ring. The lateral confinement potential of the ring is approximated by square finite potential well model. The one electron energy spectrum has been found using the effective mass approximation and an exact diagonalization technique. We find that for fixed geometric dimensions, the hydrostatic pressure can lead to both blue- and red-shift of the intraband optical absorption spectrum, while only a blue-shift is observed as a result of an electric field. The effect of hydrostatic pressure on the absorption coefficient's peaks is negligibly small. With the increase of electric field strength the absorption coefficient's peaks decrease. © 2014 Elsevier B.V.