Quantum sensing of magnetic fields with molecular color centers
Name
PhysRevResearch.5.L042023.pdf
Description
Published version
Size
1.74 MB
Format
Adobe PDF
Checksum (MD5)
a84d45ed0b6f3d851721e5d55e126eb4
Author(s)
Mullin, Kathleen R
Laorenza, Daniel W
Freedman, Danna E
Rondinelli, James M
Date Issued
November 8, 2023
Journal
Physical Review Research
Publisher
American Physical Society
Version
Final published version
Abstract
Molecular color centers, such as S=1 Cr(o-tolyl)4, show promise as an adaptable platform for magnetic quantum sensing. Their intrinsically small size, i.e., 1–2 nm, enables them to sense fields at short distances and in various geometries. This feature, in conjunction with tunable optical read-out of spin information, offers the potential for molecular color centers to be a paradigm shifting materials class beyond diamond-NV centers by accessing a distance scale opaque to NVs. This capability could, for example, address ambiguity in the reported magnetic fields arising from two-dimensional magnets by allowing for a single sensing technique to be used over a wider range of distances. Yet, so far, these abilities have only been hypothesized with theoretical validation absent. We show through simulation that Cr(o-tolyl)4 can spatially resolve proximity-exchange versus direct magnetic-field effects from monolayer CrI3 by quantifying how these interactions impact the excited states of the molecule. At short distances, proximity exchange dominates through molecule-substrate interactions, but at further distances the molecule behaves as a typical magnetic sensor, with magnetostatic effects dominating changes to the energy of the excited state. Our models effectively demonstrate how a molecular color center could be used to measure the magnetic field of a two-dimensional magnet and the role different distance-dependent interactions contribute to the measured field.
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DOI of Published Version
https://doi.org/10.1103/PhysRevResearch.5.L042023
