Jahn--Teller Distortion of the Zinc Vacancy in ZnGeP₂

A symmetry analysis and a simple dangling bond model are presented for
the V^-_Zn in ZnGeP₂, identifying a possible Jahn--Teller distortion mechanism which could naturally explain the localization of the defect wavefunction on two of the nearest-neighbouring P atoms, as deduced for the electron nuclear double resonance experiments.