Linear Hyperfine Tuning of Donor Spins in Silicon Using Hydrostatic Strain

Physical Review Letters
J MansirJohn J L Morton

Abstract

We experimentally study the coupling of group V donor spins in silicon to mechanical strain, and measure strain-induced frequency shifts that are linear in strain, in contrast to the quadratic dependence predicted by the valley repopulation model (VRM), and therefore orders of magnitude greater than that predicted by the VRM for small strains |ϵ|<10^{-5}. Through both tight-binding and first principles calculations we find that these shifts arise from a linear tuning of the donor hyperfine interaction term by the hydrostatic component of strain and achieve semiquantitative agreement with the experimental values. Our results provide a framework for making quantitative predictions of donor spins in silicon nanostructures, such as those being used to develop silicon-based quantum processors and memories. The strong spin-strain coupling we measure (up to 150 GHz per strain, for Bi donors in Si) offers a method for donor spin tuning-shifting Bi donor electron spins by over a linewidth with a hydrostatic strain of order 10^{-6}-as well as opportunities for coupling to mechanical resonators.

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Citations

Mar 13, 2020·Nature·Serwan AsaadAndrea Morello
Dec 5, 2020·Physical Review Letters·V RanjanP Bertet
Feb 13, 2021·Journal of Applied Physics·Ryan M Stein, M D Stewart
Dec 15, 2019·Journal of Magnetic Resonance·V RanjanP Bertet

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