Excited-state spin-resonance spectroscopy of V $${}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ B − defect centers in hexagonal boron nitride

Nikhil Mathur, Arunabh Mukherjee, Xingyu Gao, Jialun Luo, Brendan A. McCullian, Tongcang Li, A. Nick Vamivakas () and Gregory D. Fuchs ()
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Nikhil Mathur: Cornell University
Arunabh Mukherjee: University of Rochester
Xingyu Gao: Purdue University
Jialun Luo: Cornell University
Brendan A. McCullian: Cornell University
Tongcang Li: Purdue University
A. Nick Vamivakas: University of Rochester
Gregory D. Fuchs: Cornell University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The recently discovered spin-active boron vacancy (V $${}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ B − ) defect center in hexagonal boron nitride (hBN) has high contrast optically-detected magnetic resonance (ODMR) at room-temperature, with a spin-triplet ground-state that shows promise as a quantum sensor. Here we report temperature-dependent ODMR spectroscopy to probe spin within the orbital excited-state. Our experiments determine the excited-state spin Hamiltonian, including a room-temperature zero-field splitting of 2.1 GHz and a g-factor similar to that of the ground-state. We confirm that the resonance is associated with spin rotation in the excited-state using pulsed ODMR measurements, and we observe Zeeman-mediated level anti-crossings in both the orbital ground- and excited-state. Our observation of a single set of excited-state spin-triplet resonance from 10 to 300 K is suggestive of symmetry-lowering of the defect system from D3h to C2v. Additionally, the excited-state ODMR has strong temperature dependence of both contrast and transverse anisotropy splitting, enabling promising avenues for quantum sensing.

Date: 2022
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DOI: 10.1038/s41467-022-30772-z

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