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Long spin coherence times of nitrogen vacancy centers in milled nanodiamonds

Wood, B. D., Stimpson, G. A., March, J. E., Lekhai, Y. N. D., Stephen, C. J., Green, B. L., Frangeskou, A. C., Ginés, L., Mandal, S. ORCID:, Williams, O. A. ORCID: and Morley, G. W. 2022. Long spin coherence times of nitrogen vacancy centers in milled nanodiamonds. Physical Review B 105 (20) , 205401. 10.1103/PhysRevB.105.205401

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Nanodiamonds containing negatively charged nitrogen vacancy centers (NV−) have applications as localized sensors in biological materials and have been proposed as a platform to probe the macroscopic limits of spatial superposition and the quantum nature of gravity. A key requirement for these applications is to obtain nanodiamonds containing NV− with long spin coherence times. Using milling to fabricate nanodiamonds processes the full 3D volume of the bulk material at once, unlike etching pillars, but has, up to now, limited NV− spin coherence times. Here, we use natural isotopic abundance nanodiamonds produced by Si3N4 ball milling of chemical vapor deposition grown bulk diamond with an average single substitutional nitrogen concentration of 121ppb. We show that the electron spin coherence times of NV− centers in these nanodiamonds can exceed 400 μs at room temperature with dynamical decoupling. Scanning electron microscopy provides images of the specific nanodiamonds containing NV− for which a spin coherence time was measured.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 2469-9950
Date of First Compliant Deposit: 7 June 2022
Date of Acceptance: 7 April 2022
Last Modified: 02 May 2023 17:20

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