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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 13: Diamond I

KFM 13.4: Talk

Wednesday, March 14, 2018, 10:40–11:00, E 020

Magnetic Resonance in Defect Spins via Spin Waves — •Clara Mühlherr, Vladyslav Shkolnykov, and Guido Burkard — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

Searching for quantum systems to realize quantum computation, the nitrogen-vacancy (NV) center in diamond has been intensively studied for years. Despite favorable properties such as remarkable coherence times, an application of ensembles of NV centers to perform quantum computing raises some technical issues. Since a direct coupling of NV centers via spin-spin dipolar interaction requires the NV centers to be separated by less than a few nanometers, this proximity limits the addressability of a single center. To overcome this problem, enhancement of coherent interaction between NV centers and a microwave field recently has been demonstrated using spin waves propagating in an yttrium iron garnet (YIG) film [1]. We analyze the optically detected magnetic resonance (ODMR) spectra by combining the occurring resonances and the orientation of the external magnetic field in the YIG. In that way, the crystal orientation of the NV centers is identified, which, in turn, nicely links to applications of NV centers for sensing. In order to explain the coupling mechanism and to estimate the enhancement of the coupling strength, we theoretically calculate the amplitude of the spin waves in the YIG.

• [1] P. Andrich et al. Long-range spin wave mediated control of defect qubits in nanodiamonds. npj Quantum Information 3, 28 (2017).