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

Abstract

Point defects in wide-bandgap semiconductors are emerging as versatile resources for nanoscale sensing and quantum information science but our understanding of the photo-ionization 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 non-local fluorescence patterns emerging from local laser excitation, we show that in the simultaneous presence of photo-generated 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.

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• Optical activation and detection of charge transport between individual color centers in room-temperature diamond
• Optical control of the charge state of color centers in hexagonal boron nitride
• On the accuracy of the HSE hybrid functional to describe many-electron interactions and charge localization in semiconductors
• Spin readout via spin-to-charge conversion in bulk diamond nitrogen-vacancy ensembles
• Doubly-charged silicon vacancy center, photochromism, and Si-N complexes in co-doped diamond
• Probing metastable space-charge potentials in a wide bandgap semiconductor
• Room-temperature photo-chromism of silicon vacancy centers in CVD diamond
• Fast optoelectronic charge state conversion of silicon vacancies in diamond
• Neutral Silicon Vacancy Centers in Diamond via Photoactivated Itinerant Carriers
• Dark defect charge dynamics in bulk chemical-vapor-deposition-grown diamonds probed via nitrogen vacancy centers
• Long-term spin state storage using ancilla charge memories
• Photo-induced charge state dynamics of the neutral and negatively charged silicon vacancy centers in room-temperature diamond
• Wavelength dependence of nitrogen-vacancy center charge cycling
• Probing itinerant carrier dynamics at the diamond surface using single nitrogen vacancy centers
• Probing NV and SiV charge state dynamics using high-voltage nanosecond pulse and photoluminescence spectral analysis
• High resolution imaging with anomalous saturated excitation
• Probing charge dynamics in diamond with an individual color center