A single spin in hexagonal boron nitride for vectorial quantum magnetometry.
basic_science · Level V
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- Record sourced from PubMed, PMID 40436825.
- Also identified by DOI 10.1038/s41467-025-59642-0 and PMC identifier 12119844.
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Abstract
Quantum sensing based on solid-state spin defects provides a uniquely versatile platform for nanoscale magnetometry under diverse environmental conditions. Operation of most sensors used to-date is based on projective measurement along a single axis combined with computational extrapolation. Here, we show that an individually addressable carbon-related spin defect in hexagonal boron nitride is a multi-axis nanoscale sensor with large dynamic range. For this spin-1 system, we demonstrate how its spin-dependent photodynamics give rise to three optically detected spin resonances that show up to 90% contrast and are not quenched under off-axis magnetic field exceeding 100 mT, enabling <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>μ</mi> <mspace></mspace> <mi>T</mi> <mo>/</mo> <msup><mrow><mi>Hz</mi></mrow> <mrow><mo>-</mo> <mn>1</mn> <mo>/</mo> <mn>2</mn></mrow> </msup> </math> sensitivity. Finally, we show how this system can be used to unambiguously determine the three components of a target magnetic field via the use of two bias fields. Alongside these features, the room-temperature operation and the nanometer-scale proximity enabled by the van der Waals host material further consolidate this system as a promising quantum sensing platform.