Split Ga vacancies and the unusually strong anisotropy of positron annihilation spectra in $\mathbf{\beta }$-Ga${}_2$O${}_3$

Antti Karjalainen, Vera Prozheeva, Kristoffer Simula +4

We report a systematic first principles study on positron annihilation parameters in the $\beta$-Ga${}_2$O${}_3$ lattice and Ga mono-vacancy defects complemented with orientation-dependent…