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

Table 3

Strain coefficients of the zone-center phonon modes and (in units of cm⁻¹).

GaN	−1139^a	−931^a	−300^a	−443^a	−1198^a	−885^a	−389^a	−618^a
AlN	−1208^a	−1330^a	−391^a	−70^a	−1233^a	−1038^a	−442^a	−434^a

 ^aReference [14].