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

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

2005-05-18

arxiv.org/abs/cond-mat/0505446v3

Physics

Condensed Matter

Other Condensed Matter

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Scientific paper

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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