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arXiv · 1511.06503

Hyperfine interaction mediated electric-dipole spin resonance: the role of frequency modulation

Rui Li
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Abstract

The electron spin in a semiconductor quantum dot can be coherently controlled by an external electric field, an effect called electric-dipole spin resonance (EDSR). Several mechanisms can give rise to the EDSR effect, among which there is a hyperfine mechanism, where the spin-electric coupling is mediated by the electron-nucleus hyperfine interaction. Here, we investigate the influence of frequency modulation (FM) on the spin-flip efficiency. Our results reveal that FM plays an important role in the hyperfine mechanism. Without FM, the electric field almost cannot flip the electron spin; the spin-flip probability is only about 20%. While under FM, the spin-flip probability can be improved to approximately 70%. In particular, we find that the modulation amplitude has a lower bound, which is related to the width of the fluctuated hyperfine field.

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Rui Li. 2016-04-14. Hyperfine interaction mediated electric-dipole spin resonance: the role of frequency modulation. https://doi.org/10.1088/0031-8949%2F91%2F5%2F055801

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