Bulletin of the American Physical Society
APS March Meeting 2023
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M58: GMAG: Light Matter Interaction
8:00 AM–11:00 AM,
Wednesday, March 8, 2023
Room: Room 302
Sponsoring Unit: GMAG
Chair: Zachary Morgan, Oak Ridge National Lab
Abstract: M58.00001 : Suppressing spectral diffusion of phosphorus donor electron spins in natural silicon using optical excitation*
8:00 AM–8:36 AM
Johan van Tol
(Florida State University)
Ethan Q Williams
We characterize the spin-echo decays of phosphorus donor electron spins in lightly-doped natural silicon at liquid helium temperatures and high magnetic field (8.58 T) in the dark and under optical excitation. The spectral diffusion times (TSD) measured in the dark are observed to be significantly shorter and to vary more strongly with crystal orientation (in the external field) than previous measurements at low magnetic fields (0.35 T). We also measured the echo decay as the wavelength of the optical excitation is swept across the band edge from 1047 nm to 1090 nm. At low optical powers, above-bandgap excitation is seen to increase the spectral diffusion time of the donor electron spins at most crystal orientations, while higher power optical excitation shortens both the T1 and T2 relaxation times of the donors significantly. Electron-nuclear double resonance experiments suggest that the optical excitation modulates the hyperfine interactions in the sample.
*This work was supported in part by the NSF under cooperative agreement OIA-1921199 and grant DMR-1747426. Work done at the National High Magnetic Field Laboratory was supported by the NSF under grant DMR-1644779 and the State of Florida.
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