Spectral diffusion of phosphorus donors in silicon at high magnetic field

• URL: http://arxiv.org/abs/2107.06390v1
• Date: Tue, 13 Jul 2021 21:07:31 GMT
• Title: Spectral diffusion of phosphorus donors in silicon at high magnetic field
• Authors: Lihuang Zhu, Johan van Tol, Chandrasekhar Ramanathan
• Abstract summary: We characterize the phase memory time of phosphorus donor electron spins in lightly-doped natural silicon. The spin echo decays are dominated by spectral diffusion due to the presence of the 4.7% abundant spin-1/2 silicon-29 nuclei.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We characterize the phase memory time of phosphorus donor electron spins in lightly-doped natural silicon at high magnetic field (8.58 T) in the dark and under low-power optical excitation. The spin echo decays are dominated by spectral diffusion due to the presence of the 4.7% abundant spin-1/2 silicon-29 nuclei. At 4.2 K, the spectral diffusion time (T$_{SD}$) measured in the dark is $124 \pm 7$ $\mu$s, a factor of 2 smaller than that measured at low magnetic fields (0.35 T). Using a tunable laser we also measured the echo decay as the wavelength of the optical excitation is swept across the band edge from 1050 nm to 1090 nm. Above-bandgap optical excitation is seen to increase the spectral diffusion time of the donor electron spin to $201 \pm 11$ $\mu$s. The physical mechanism underlying both the decrease of T$_{SD}$ at high field and the subsequent increase under optical excitation remains unclear.

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