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On-Demand Generation of Neutral and Negatively Charged Silicon-Vacancy Centers in Diamond

Dhomkar, S; Zangara, PR; Henshaw, J; Meriles, CA; (2018) On-Demand Generation of Neutral and Negatively Charged Silicon-Vacancy Centers in Diamond. Physical Review Letters , 120 (11) , Article 117401. 10.1103/PhysRevLett.120.117401. Green open access

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Abstract

Point defects in wide-band-gap semiconductors are emerging as versatile resources for nanoscale sensing and quantum information science, but our understanding of the photoionization dynamics is presently incomplete. Here, we use two-color confocal microscopy to investigate the dynamics of charge in type 1b diamond hosting nitrogen-vacancy (NV) and silicon-vacancy (SiV) centers. By examining the nonlocal fluorescence patterns emerging from local laser excitation, we show that, in the simultaneous presence of photogenerated electrons and holes, SiV (NV) centers selectively transform into the negative (neutral) charge state. Unlike NVs, 532 nm illumination ionizes SiV⁻ via a single-photon process, thus hinting at a comparatively shallower ground state. In particular, slower ionization rates at longer wavelengths suggest the latter lies approximately ∼1.9 eV below the conduction band minimum. Building on the above observations, we demonstrate on-demand SiV and NV charge initialization over large areas via green laser illumination of variable intensity.

Type: Article
Title: On-Demand Generation of Neutral and Negatively Charged Silicon-Vacancy Centers in Diamond
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.120.117401
Publisher version: https://doi.org/10.1103/PhysRevLett.120.117401
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Charge, Defects, Nitrogen vacancy centers in diamond, Diamond, Elemental semiconductors, Elemental semiconductors, Optical techniques
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10053786
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