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Millisecond spin lifetimes in quantum dots at zero applied magnetic field due to strong electron-nuclear interaction

A. Greilich·R. Oulton·S. Yu. Verbin·R. V. Cherbunin·T. Auer·D. R. Yakovlev·M. Bayer·V. Stavarache·D. Reuter·A. Wieck
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Abstract

A key to achieving ultra-long electron spin memory in quantum dots (QDs) at 0~$T$ is the polarization of the nuclei, such that the electron spin is stabilized along the nuclear magnetic field. We demonstrate that spin-polarized electrons in n-doped QDs align the nuclear field via the hyperfine interaction. A feedback onto the electrons occurs, leading to stabilization of electron polarization. We suggest that the coupled electron-nuclear system forms a rigid nuclear spin polaron state as predicted by I.A.~Merkulov, for which spin memory is retained over millisecond lifetimes.

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A. Greilich, R. Oulton, S. Yu. Verbin, R. V. Cherbunin, T. Auer, D. R. Yakovlev, M. Bayer, V. Stavarache, D. Reuter, A. Wieck. 2006-04-03. Millisecond spin lifetimes in quantum dots at zero applied magnetic field due to strong electron-nuclear interaction. https://arxiv.org/abs/cond-mat/0505446

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