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Reduction of surface spin-induced electron spin relaxations in nanodiamonds

ORAL

Abstract

Nanodiamonds (NDs) hosting nitrogen-vacancy (NV) centers are promising for applications of quantum sensing. Long spin relaxation times (T1 and T2) are critical for high sensitivity in quantum applications. Our recent study has shown the presence of surface impurities such as dangling bonds and graphite layers [1]. It has also been shown that fluctuations of magnetic fields due to surface spins strongly influence the spin relaxation times in NDs. In this presentation, we discuss the improvement of T1 and T2 of single-substitutional nitrogen impurity (P1) centers in NDs by removing the surface spins [2]. By employing high-frequency electron paramagnetic resonance spectroscopy, we verify that the etching of NDs removes surface spins efficiently and significantly reduces their contribution to T1. We also discuss T1 and T2 of NV centers in etched NDs.

References:
[1] Z. Peng et al., J. Chem. Phys. 150, 134702 (2019).
[2] Z. Peng et al., J. Appl. Phys. 128, 054301 (2020).

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Presenters

  • Yuxiao Hang

    Department of Physics & Astronomy, University of Southern California, Los Angeles, CA, Dept. of Physics & Astronomy, Univ of Southern California

Authors

  • Yuxiao Hang

    Department of Physics & Astronomy, University of Southern California, Los Angeles, CA, Dept. of Physics & Astronomy, Univ of Southern California

  • Ana Gurgenidze

    Department of Chemistry, University of Southern California, Los Angeles, CA

  • Benjamin Fortman

    Department of Chemistry, University of Southern California, Los Angeles, CA, Dept. of Chemistry, Univ of Southern California

  • Zaili Peng

    Department of Chemistry, University of Southern California, Los Angeles, CA

  • Susumu Takahashi

    Department of Chemistry and Department of Physics & Astronomy, University of Southern California, Los Angeles, CA, Dept. of Physics & Astronomy, Univ of Southern California