Engineering shallow spins in diamond with nitrogen delta-doping

ORAL

Abstract

The excellent spin properties of diamond nitrogen-vacancy (NV) centers motivate applications from sensing to quantum information processing. Still, external electron and nuclear spin sensing are limited by weak magnetic dipole interactions, requiring NVs be within a few nm of the surface and retain long spin coherence times ($T_2$). We report a nitrogen delta-doping technique to create artificial NVs meeting these requirements. Isotopically pure $^{15}$N$_2$ gas is introduced to form a thin N-doped layer (1--2 nm thick) during chemical vapor deposition of a diamond film. Post growth electron irradiation creates vacancies and subsequent annealing forms NVs while mitigating crystal damage. We identified doped NVs through the hyperfine signature of the rare $^{15}$N isotope in electron spin resonance measurements. We confirm the doped NV depth dispersion is less than 4 nm by doping NVs in the $^{12}$C layer of an isotopically engineered $^{13}$C/$^{12}$C/$^{13}$C structure and probing the coupling between the doped NVs and the $^{13}$C nuclear spins. Furthermore, despite their surface proximity, doped NVs embedded in $^{12}$C films 5 (52) nm below the surface show $T_2$ greater than 100 (600) $\mu$s [1].\\[4pt] [1] K. Ohno \emph{et al.}, Appl. Phys. Lett. \textbf{101}, 082413 (2012).

–

Authors

  • K. Ohno

    Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106

  • F.J. Heremans

    Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106

  • L.C. Bassett

    Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106

  • Bryan Myers

    Physics Department, University of California, Santa Barbara, University of California Santa Barbara, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106

  • David M. Toyli

    Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA 93106, Center for Spintronics and Quantum Computation, University of California, Santa Barbara

  • Ania Jayich

    University of California Santa Barbara, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106

  • Chris Palmstr\O m

    Department of Electrical and Computer Engineering and Materials Science; University of California, Santa Barbara, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106, University of California, Santa Barbara

  • D.D. Awschalom

    Center for Spintronics and Quantum Computation, Univ. of California Santa Barbara, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, Department of Physics and California Nanosystems Institute, University of California, Santa Barbara, University of California Santa Barbara, Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA, 93106, Center for Spintronics and Quantum Computation, University of California, Santa Barbara