Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Photonik 1

Q 23.1: Vortrag

Dienstag, 13. März 2012, 10:30–10:45, V38.01

Low temperature studies of charge dynamics of nitrogen-vacancy center — •Petr Siyushev1, Adam Gali2, Fedor Jelezko3, and Jörg Wrachtrup113. Physikalisches Institut and Research Center SCOPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, 1525 Budapest, Hungary — 3Institut für Quantenoptik, Universität Ulm, Ulm D-89073, Germany

Nitrogen-vacancy center duo to its exceptional properties is a promising candidate for quantum information processing, quantum metrology, nanoscale magnetometery and electric field sensing. Nevertheless, all applications mentioned above relate to one particular charge state, namely negative, whereas NV center can occur in at least two: negative and neutral. Therefore, it is highly desirable to understand charge switching mechanism of the defect. We show direct evidence of the photoionization process of a single NV center under resonant excitation via photoluminescence excitation spectrum detection of its neutral counterpart. It is found that excitation of NV0 at its zero-phonon line leads to recovering of the negative charge state. This type of conversion allows significantly improve spectral stability of NV center. Moreover, charge state can be deterministically prepared. New model of charge switching, not involving any additional impurities close to NV defect, is tentatively proposed.

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