Hydrostatic Pressure and Built-In Electric Field Effects on the Donor Impurity States in Cylindrical Wurtzite GaN/Al_xGa_1−xN Quantum Rings

Figure 7

The ground-state donor binding energy in cylindrical wurtzite GaN/ strained QR as a function of the axial impurity position for  nm,  nm,  nm,  nm, and several values of the hydrostatic pressure .