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Influence of Nuclear Quadrupole Moments on Electron Spin Coherence in Semiconductor Quantum Dots

Influence of Nuclear Quadrupole Moments on Electron Spin Coherence in Semiconductor Quantum Dots

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WELANDER, Erik, Evgeny CHEKHOVICH, Alexander TARTAKOVSKII, Guido BURKARD, 2014. Influence of Nuclear Quadrupole Moments on Electron Spin Coherence in Semiconductor Quantum Dots

@unpublished{Welander2014Influ-29145, title={Influence of Nuclear Quadrupole Moments on Electron Spin Coherence in Semiconductor Quantum Dots}, year={2014}, author={Welander, Erik and Chekhovich, Evgeny and Tartakovskii, Alexander and Burkard, Guido} }

Welander, Erik 2014 Burkard, Guido Welander, Erik Burkard, Guido Chekhovich, Evgeny Tartakovskii, Alexander 2014-10-21T08:14:07Z Influence of Nuclear Quadrupole Moments on Electron Spin Coherence in Semiconductor Quantum Dots Tartakovskii, Alexander Chekhovich, Evgeny eng 2014-10-21T08:14:07Z We theoretically investigate the influence of the fluctuating Overhauser field on the spin of an electron confined to a quantum dot (QD). The fluctuations arise from nuclear angular momentum being exchanged between different nuclei via the nuclear magnetic dipole coupling. We focus on the role of the nuclear electric quadrupole moments (QPMs), which generally cause a reduction in internuclear spin transfer efficiency in the presence of electric field gradients. The effects on the electron spin coherence time are studied by modeling an electron spin echo experiment. We find that the QPMs cause an<br />increase in the electron spin coherence time and that an inhomogeneous distribution of the quadrupolar shift, where different nuclei have different shifts in energy, causes an even larger increase in the electron coherence time than a homogeneous distribution. Furthermore, a partial polarization of the nuclear spin ensemble amplifies the effect of the inhomogeneous quadrupolar shifts, causing an additional increase in electron coherence time, and providesan alternative to the experimentally challenging suggestion of full dynamic nuclear spin polarization.

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