Bulletin of the American Physical Society
New England Section Fall 2022 Meeting
Volume 67, Number 13
Friday–Saturday, October 14–15, 2022; University of New Hampshire, Durham, NH
Session H01: Parallel Invited Session - Condensed Matter III |
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Chair: Shawna Hollen, Brown University Room: University of New Hampshire in Durham DeMeritt Hall 112 |
Saturday, October 15, 2022 10:30AM - 11:06AM |
H01.00001: TBA Invited Speaker: Liang Fu TBA |
Saturday, October 15, 2022 11:06AM - 11:42AM |
H01.00002: Spectral Diffusion of Phosphorus Donors in Silicon at High Magnetic Field Invited Speaker: Chandrasekhar Ramanathan Donor and defect electronic spins in solids are promising platforms for quantum technologies. Understanding how these potential electron spin qubit candidates decohere under different experimental conditions is key to enabling improved materials design and to identifying optimal operating conditions. The donor electrons in phosphorus-doped silicon (Si:P) have some of the longest coherence times observed in solid-state spin systems. Natural silicon consists of 3 isotopes - 28Si, 29Si and 30Si. While the 4.7% abundant 29Si is a spin-1/2 nucleus, 28Si and 30Si are spin-0 nuclei. Many-body magnetic dipolar interactions between the 29Si nuclear spins induce a fluctuating nuclear magnetic field at the site of the donor electron spin resulting in a decay of the electron spin coherence. This spectral diffusion due to the 29Si spins is the dominant source of spin echo decay in lightly-doped natural Si:P samples at and below 4 K in low magnetic fields (< 0.5 T). The elimination of the spin-1/2 29Si nuclei was seen to dramatically suppress spectral diffusion of the phosphorus donor electron resonance in low-field experiments. |
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