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Overhauser effect in individual InP/GaInP dots

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arxiv 0710.2837 v3 pith:HT5TFARK submitted 2007-10-15 cond-mat.mes-hall cond-mat.mtrl-sci

Overhauser effect in individual InP/GaInP dots

J. Skiba-Szymanska , A. V. Nikolaenko , E. A. Chekhovich , A. I. Tartakovskii , M. N. Makhonin , I. Drouzas , M. S. Skolnick , A. B. Krysa This is my paper
classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords fieldnuclearoverhauserspinzeemanbextdotsenergy
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Sizable nuclear spin polarization is pumped in individual InP/GaInP dots in a wide range of external magnetic fields B_ext=0-5T by circularly polarized optical excitation. We observe nuclear polarization of up to ~40% at Bext=1.5T and corresponding to an Overhauser field of ~1.2T. We find a strong feedback of the nuclear spin on the spin pumping efficiency. This feedback, produced by the Overhauser field, leads to nuclear spin bi-stability at low magnetic fields of Bext=0.5-1.5T. We find that the exciton Zeeman energy increases markedly, when the Overhauser field cancels the external field. This counter-intuitive result is shown to arise from the opposite contribution of the electron and hole Zeeman splittings to the total exciton Zeeman energy.

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