3 papers
cond-mat.mtrl-sci2020
Split Ga vacancies and the unusually strong anisotropy of positron annihilation spectra in -GaO
Antti Karjalainen, Vera Prozheeva, Kristoffer Simula +4
We report a systematic first principles study on positron annihilation parameters in the -GaO lattice and Ga mono-vacancy defects complemented with orientation-dependent…
cond-mat.mes-hall2018
Nature of the positron state in CdSe quantum dots
Wenqin Shi, Vincent Callewaert, Bernardo Barbiellini +11
Previous studies have shown that positron-annihilation spectroscopy is a highly sensitive probe of the electronic structure and surface composition of ligand-capped semiconductor Q…
cond-mat.mtrl-sci2016
Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials
Vincent Callewaert, K. Shastry, Rolando Saniz +8
Topological insulators are attracting considerable interest due to their potential for technological applications and as platforms for exploring wide-ranging fundamental science qu…