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Towards experimental identification of vacancy complexes in InN
Author(s) -
Rauch Christian,
Makkonen Ilja,
Tuomisto Filip
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201001160
Subject(s) - vacancy defect , positron , annihilation , positron annihilation , positron annihilation spectroscopy , momentum (technical analysis) , atomic physics , ab initio , physics , electron , materials science , nuclear physics , condensed matter physics , quantum mechanics , finance , economics
In this contribution we present ab initio calculations of positron states and annihilation at vacancies and vacancy complexes in InN. Momentum distributions of annihilating electron–positron pairs in indium ( V In ) and nitrogen vacancies ( V N ) as well as mixed vacancy clusters are calculated. Based on the modelled data the possibility of their experimental detection and distinction using positron annihilation spectroscopy is discussed. No localization of the positron density is found for isolated V N and V N clusters of up to 4 V N . On the other hand, V In and mixed vacancy clusters act as efficient positron traps in InN. While the calculated momentum distributions for the divacancy and V In are quite close, mixed vacancy clusters which contain one V In and two or more V N show well distinct spectra, that could be distinguished in suitable positron annihilation experiments.