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- W2024556312 abstract "Bismuth (${}^{209}$Bi) is the deepest group V donor in silicon and possesses the most extreme characteristics such as a 9/2 nuclear spin and a 1.5 GHz hyperfine coupling. These lead to several potential advantages for a Si:Bi donor electron spin qubit compared to the more common phosphorus donor. Most previous studies on Si:Bi have been performed using natural silicon where linewidths and electron spin coherence times are limited by the presence of ${}^{29}$Si impurities. Here, we describe electron spin resonance (ESR) and electron nuclear double resonance (ENDOR) studies on ${}^{209}$Bi in isotopically pure ${}^{28}$Si. ESR and ENDOR linewidths, transition probabilities, and coherence times are understood in terms of the spin Hamiltonian parameters showing a dependence on field and ${m}_{I}$ of the ${}^{209}$Bi nuclear spin. We explore various decoherence mechanisms applicable to the donor electron spin, measuring coherence times up to 700 ms at 1.7 K at X band, comparable with ${}^{28}$Si:P. Importantly, the coherence times we measure follow closely to the calculated field gradients of the transition frequencies ($df/dB$), providing a strong motivation to explore ``clock'' transitions where coherence lifetimes could be further enhanced." @default.
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- W2024556312 date "2012-12-04" @default.
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- W2024556312 title "Decoherence mechanisms of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mn>209</mml:mn></mml:msup></mml:math>Bi donor electron spins in isotopically pure<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mn>28</mml:mn></mml:msup></mml:math>Si" @default.
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- W2024556312 doi "https://doi.org/10.1103/physrevb.86.245301" @default.
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