 to the plane of the QW).**a** Surfaces (light green) corresponding to a charge density of 0.00 *e*/Å^0^ for the *p*~*z*~ orbital. The *z* axis is along the \[0000\] direction of the wurtzite lattice. **b** Distance *d* variation between the nearest N atoms. **c** Schematic of the band offset. The shape of the DOS drawn in **c** is illustrative and does not represent the actual band edge profile. **d** Coupling potential between *p*~*