Spectral diffusion of phosphorus donors in silicon at high magnetic field

Abstract:We study the central spin physics of a phosphorus donor electron in silicon interacting with a silicon-29 bath at high magnetic field (8.59 T). We find that the spectral diffusion time is shorter and exhibits a larger anisotropy with respect to crystal orientation in the magnetic field than in previous measurements at 0.35 T. The increased anisotropy suggests a modification of the hyperfine interactions at high field. The 1.2 THz cyclotron energy is a significant fraction of the 10.8 THz Rydberg energy of the bound donor, which can result in a non-trivial magnetic perturbation of the hydrogenic donor wavefunction. Low-power, above-bandgap optical excitation is seen to increase the spectral diffusion time, recovering the low-field spectral diffusion time at most crystal orientations. Understanding such perturbations to the spatial wavefunction of donor electron spins could be key to engineering their high-fidelity control.

Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall)

arXiv:2107.06390 [quant-ph]

(or arXiv:2107.06390v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2107.06390 Focus to learn more arXiv-issued DOI via DataCite

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