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TT: Fachverband Tiefe Temperaturen

TT 66: Spintronics / Quantum Information: Vacancies in Diamond and SiC (jointly with HL)

TT 66.11: Vortrag

Freitag, 15. März 2013, 12:15–12:30, H14

Resolving individual spin defects in diamond beyond the diffraction limit by exploiting their charge state dynamics — •Nabeel Aslam, Matthias Pfender, Gerald Waldherr, Philipp Neumann, and Jörg Wrachtrup — 3. Physikalisches Institut, Universität Stuttgart, Germany

The nitrogen-vacancy center in diamond is an electron and nuclear spin system that shows exceptionally good coherence properties at room temperature. This makes it a promising system for the implementation of quantum information processing. Furthermore the ability to sense magnetic and electric fields on the nanometer scale has been demonstrated for NV defects. Individual spin detection and initialization is performed optically by a confocal microscope which fails in resolving individual defects with a distance smaller than the diffraction limit. Here we demonstrate a novel microscopy method that is able to exploit the stochastically switching between different charge states achieving resolutions of 10 nm, well below the diffraction barrier. Compared with targeted switching based methods like STED this method applies at least five magnitudes lower laser power for a certain resolution. This is in fact a great improvement for the future use of nanodiamonds as biomarkers in cells with nanometer resolution. Even better resolutions can be achieved by combining this method with spin state manipulation.