Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.9: Poster
Dienstag, 26. Februar 2008, 14:30–19:30, Poster A
Optically detected magnetic resonance of single N-V centers in diamond for molecular spintronics — •Juliane Kniepert, Kati Hübener, Christoph Oelmüller, and Wolfgang Harneit — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
An important issue in molecular spintronics is the detection and state read-out of single spins or small spin ensembles as occur in molecular nanostructures. With their typical sensitivity of 1012 to 1014 spins, conventional ESR methods are not suitable for single spin detection. Optical detection (ODMR) improves the sensitivity to 105 spins. Combined with single molecule spectroscopy, the spin of an individual molecule becomes accessible.
Here, we apply the method of single spin detection to N-V centers in diamond as a read-out system for molecular spins. The nitrogen-vacancy (N-V) center consists of a substitutional nitrogen atom and an adjacent carbon vacancy. Irradiation of resonant microwaves changes the spin polarization of the ground state, resulting in a decrease of the fluorescence intensity. N-V centers are also interesting for the field of quantum information. They might be used as qubits themselves or as a read out system for other coupled spin systems e.g. organic molecules. Here we investigate the coupling of endohedral fullerenes to N-V centers. Owing to their long relaxation time endohedral fullerenes such as N@C60 may be promising candidates for quantum bits.