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Dynamic nuclear polarization and Knight shift measurements in a breakdown regime of integer quantum Hall effect

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arxiv 0711.3259 v1 pith:W46LTMLF submitted 2007-11-21 cond-mat.mes-hall

Dynamic nuclear polarization and Knight shift measurements in a breakdown regime of integer quantum Hall effect

classification cond-mat.mes-hall
keywords nuclearspinsbreakdowneffectelectronhallknightpolarized
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Nuclear spins are polarized electrically in a breakdown regime of an odd-integer quantum Hall effect (QHE). Electron excitation to the upper Landau subband with the opposite spin polarity flips nuclear spins through the hyperfine interaction. The polarized nuclear spins reduce the spin-splitting energy and accelerate the QHE breakdown. The Knight shift of the nuclear spins is also measured by tuning electron density during the irradiation of radio-frequency magnetic fields.

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