Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 76: Quantum Information Systems I (organized by HL)

TT 76.4: Vortrag

Mittwoch, 2. April 2014, 15:45–16:00, POT 006

Interaction between differently charged states of the nitrogen vacancy in diamond — •Dion Braukmann¹, J. Debus¹, D. Dunker¹, V. Yu. Ivanov², D. R. Yakovlev¹, and M. Bayer¹ — ¹Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany — ²Institute of Physics, Polish Academy of Sciences, 02668 Warsaw, Poland

The nitrogen vacancy (NV) in diamond is studied on account of its possible applications in spin-electronics. Temperature-stable properties are ranked among the main advantages of the NV center: Even at room temperature spin coherence times exceed one second.^[1] The NV center appears in differently charged states. About 70% are negatively charged (NV⁻), the rest are neutral (NV⁰) centers. In contrast to the NV⁻, the NV⁰ is poorly investigated. For single NV centers it was shown that both charge states can transform into each other. In that context, an ensemble of NV centers has not been studied yet. We report on polarization-dependent optical characterization of ensembles of NV⁻ and NV⁰ centers in diamond subjected to high magnetic fields, thus providing insight into their level structures. The talk will be focused on interactions between both charged states. We observe a strong increase in NV⁻ ZPL intensity and a characteristic resonance of the NV⁻ ZPL energy when the NV⁰ center is excited resonantly. This behavior can either be explained by a change in the charge state or by a Förster resonant energy transfer. Both possibilities will be discussed in detail.
[1] P. C. Maurer et al., Science, 336, 1283 (2012).