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HL: Fachverband Halbleiterphysik
HL 61: Poster II: Materials, Interfaces and Heterostructures
HL 61.14: Poster
Donnerstag, 25. März 2010, 18:00–20:00, Poster D1
Excited States of the Negatively Charged Nitrogen-Vacancy Color Center in Diamond — •Yuchen Ma1, Michael Rohlfing1, and Adam Gali2 — 1Fachbereich Physik, Universität Osnabrück, Germany — 2Department of Atomic Physics, Budapest University of Technology and Economics, Hungary
Optical excitation in the negatively charged nitrogen-vacancy (NV) color center in diamond induces a strong spin polarization in the ground-state, which makes the NV center a competitive candidate for solid state quantum information processing and nanoscale magnetic imaging. However, the excited-state structure and the spin-polarization process of the NV center are not yet fully understood. Here we investigate details of the excitations within ab initio many-body perturbation theory (MBPT). We find that three singlets, one of which exhibiting an intersystem crossing with the excited triplet, may be relevant for the fluorescence process in a way which has never been considered before. The calculated zero-phonon line (ZPL) for the visible excitation and that for the transition among the singlets are in good agreement with the experiments. Our results provide new insight into the optical process in the NV center relevant for its future application.