Impurity strength and impurity domain modulated frequency dependent linear and second non linear response properties of doped quantum dots
We explore the pattern of frequency dependent linear and second non linear optical responses of repulsive impurity doped quantum dots harmonically confined in two dimensions. The dopant impurity potential chosen assumes a Gaussian form and it is doped into an on center location. The quantum dot is subject to a periodically oscillating external electric field. For some fixed values of transverse magnetic field strength (oc) and harmonic confinement potential (o0) the influence of impurity strength (V0) and impurity domain (x) on the diagonal components of the frequency dependent linear (axx and ayy) and second non linear (gxxxx and gyyyy) responses of the dot are computed through a linear variational route. The investigations reveal that the optical responses undergo enhancement with increase in both V0 and x values. However, in the limitingly small dopant strength regime one observes a drop in the optical responses with increase in V0. A time average rate of energy transfer to the system is often invoked to support the findings.