Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster 1

Q 34.15: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II

Coherence of single spins in diamond in nanometer distance to the surface — •Tobias Staudacher1,2, Fazhan Shi1,3, Sébastien Pezzagna4, Jan Meijer4, Alexander Petrajtis1, Boris Naydenov5, Jiangfeng Du3, Andrej Denisenko1, Friedemann Reinhard1, and Jörg Wrachtrup113. Institute of Physics and Research Center SCOPE, University Stuttgart, D-70550 Stuttgart — 2International Max Planck Research School for Advanced Materials, D-70569 Stuttgart — 3Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 — 4RUBION, Ruhr-Universität Bochum, D-44780 Bochum — 5Institut für Quantenoptik, Universität Ulm, D-89069 Ulm

The nitrogen vacancy (NV) center in diamond seems to be an ideal candidate for ultrasensitive nanoscale magnetometry, due to the possibility to prepare and detect its spin state by optical means as well as its long coherence times. For the detection of spins outside the diamond lattice, reliable spin properties in the close vicinity to the surface are required. The proximity to the surface degrades the coherence, and hence the field sensitivity is reduced in exchange for a smaller separation between the NVs and an external spin. We investigate the effect of the surface proximity on the coherence of single NV centers, which have been implanted a few nanometers below the diamond surface. The experimental methods include dynamical decoupling sequences, double electron electron resonance techniques and varying surface treatments before and after the implantation process.

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