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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.26: Poster

Dienstag, 17. März 2015, 14:00–20:00, Poster F

Spectroscopy of surface-induced noise using shallow spins in diamond — •Christoph Müller¹, Thomas Unden¹, Yoav Romach², Lachlan Rogers¹, Boris Naydenov¹, Liam McGuinness¹, Nir Bar-Gill², and Fedor Jelezko¹ — ¹Institute for Quantum Optics and Center for Integrated Quantum Science and Technology, University of Ulm, 89081 Ulm, Germany — ²The Racah Institute of Physics, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel

Nitrogen-vacancy centres (NV) in diamond located a few nanometers below the surface were exploit to gain insight into the dynamics of the surface noise spectrum they experience. A double-Lorentzian noise spectrum was resolved, consisting of a slow component arising from spin-spin interactions of an electronic spin bath and a faster component related to phononic coupling. Dynamical decoupling sequences were used to decouple the NV spin from this surface noise and enhance their coherence properties.