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Spatially Resolved Decoherence of Donor Spins in Silicon Strained by a Metallic Electrode

Ranjan, V; Albanese, B; Albertinale, E; Billaud, E; Flanigan, D; Pla, JJ; Schenkel, T; ... Bertet, P; + view all (2021) Spatially Resolved Decoherence of Donor Spins in Silicon Strained by a Metallic Electrode. Physical Review X , 11 (3) , Article 031036. 10.1103/PhysRevX.11.031036. Green open access

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Abstract

Electron spins are amongst the most coherent solid-state systems known. However, to be used in devices for quantum sensing and information processing applications, they must typically be placed near interfaces. Understanding and mitigating the impacts of such interfaces on the coherence and spectral properties of electron spins is critical to realizing such applications, but it is also challenging: Inferring such data from single-spin studies requires many measurements to obtain meaningful results, while ensemble measurements typically give averaged results that hide critical information. Here, we report a comprehensive study of the coherence of near-surface bismuth donor spins in 28-silicon at millikelvin temperatures. In particular, we use strain-induced frequency shifts caused by a metallic electrode to infer spatial maps of spin coherence as a function of position relative to the electrode. By measuring magnetic-field-insensitive clock transitions, we separate magnetic noise caused by surface spins from charge noise. Our results include quantitative models of the strain-split spin resonance spectra and extraction of paramagnetic impurity concentrations at the silicon surface. The interplay of these decoherence mechanisms for such near-surface electron spins is critical for their application in quantum technologies, while the combination of the strain splitting and clock transition extends the coherence lifetimes by up to 2 orders of magnitude, reaching up to 300 ms at a mean depth of only 100 nm. The technique we introduce here to spatially map coherence in near-surface ensembles is directly applicable to other spin systems of active interest, such as defects in diamond, silicon carbide, and rare earth ions in optical crystals.

Type: Article
Title: Spatially Resolved Decoherence of Donor Spins in Silicon Strained by a Metallic Electrode
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevX.11.031036
Publisher version: https://doi.org/10.1103/PhysRevX.11.031036
Language: English
Additional information: © 2022 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/).
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10150305
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