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HL: Fachverband Halbleiterphysik
HL 34: Carbon: Diamond, nanotubes, Buckyballs
HL 34.3: Vortrag
Donnerstag, 15. März 2018, 10:00–10:15, EW 015
Fano effect in an ensemble of nitrogen vacancies in diamond under resonant excitation conditions — •Dion Braukmann1, Vladimir P. Popov2, Evan R. Glaser3, Thomas A. Kennedy3, Manfred Bayer1,4, and Jörg Debus1 — 1Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany — 2Rzhanov Institute of Semiconductor Physics, SB RAS, 630090 Novosibirsk, Russia — 3Naval Research Laboratory, Washington, DC 20375, USA — 4Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
Photoluminescence excitation (PLE) enables the observation of the Fano effect in an ensemble of nitrogen vacancy (NV) centers in diamond. We see a Fano resonance at resonant excitation of the NV center. Due to ensemble effects the impact of the resonance is not seen in the intensity of the NV zero phonon line (ZPL), but in a distinct energy shift. The ZPL intensity however shows a different resonance, which can be associated with a recharging process between neutral NV0 and the negatively charged NV− centers. In fact, resonant excitation of the NV0 center at 2.156 eV leads to a strong increase in the NV− ZPL emission at 1.946 eV. Temperature and excitation power dependent, spectrally resolved PLE measurements show, that due to effective recharging, the ZPL intensity can be increased about a factor of 25. Moreover, time resolved measurements reveal that the charge state can be selectively addressed in timescales of up to one hour.