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arXiv · 0904.0917

Probing Quantum Hall Pseudospin Ferromagnet by Resistively Detected NMR

G. P. Guo·Y. J. Zhao·T. Tu·X. J. Hao·G. C. Guo·H. W. Jiang
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Abstract

Resistively Detected Nuclear Magnetic Resonance (RD-NMR) has been used to investigate a two-subband electron system in a regime where quantum Hall pseudo-spin ferromagnetic (QHPF) states are prominently developed. It reveals that the easy-axis QHPF state around the total filling factor $\nu =4 $ can be detected by the RD-NMR measurement. Approaching one of the Landau level (LL) crossing points, the RD-NMR signal strength and the nuclear spin relaxation rate $1/T_{1}$ enhance significantly, a signature of low energy spin excitations. However, the RD-NMR signal at another identical LL crossing point is surprisingly missing which presents a puzzle.

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G. P. Guo, Y. J. Zhao, T. Tu, X. J. Hao, G. C. Guo, H. W. Jiang. 2009-04-06. Probing Quantum Hall Pseudospin Ferromagnet by Resistively Detected NMR. https://doi.org/10.1103/physrevb.81.041306

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