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

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

2007-11-21

arxiv.org/abs/0711.3259v1

Physica E 40, p. 1389 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 2 figures, EP2DS-17

Scientific paper

10.1016/j.physe.2007.09.022

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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