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

Abstract

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.

3 pages, 2 figures, EP2DS-17

References in corpus (5)

• Nuclear spin induced oscillatory current in spin-blocked quantum dots
• Electrically-Controlled Nuclear Spin Polarization and Relaxation by Quantum-Hall states
• Electrical polarization of nuclear spins in a breakdown regime of quantum Hall effect
• Resistively-Detected NMR in a Two-Dimensional Electron System near $\nu =1$: Clues to the Origin of the Dispersive Lineshape
• Knight shift detection using gate-induced decoupling of the hyperfine interaction in quantum Hall edge channels

Cited by in corpus (2)

• Current-induced nuclear-spin activation in a two-dimensional electron gas
• Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime