Role of chiral quantum Hall edge states in nuclear spin polarization

Kaifeng Yang, Katsumi Nagase, Yoshiro Hirayama, Tetsuya D. Mishima, Michael B. Santos and Hongwu Liu ()
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Kaifeng Yang: State Key Lab of Superhard Materials, Institute of Atomic and Molecular Physics, Jilin University
Katsumi Nagase: Tohoku University
Yoshiro Hirayama: Tohoku University
Tetsuya D. Mishima: University of Oklahoma
Michael B. Santos: University of Oklahoma
Hongwu Liu: State Key Lab of Superhard Materials, Institute of Atomic and Molecular Physics, Jilin University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Resistively detected NMR (RDNMR) based on dynamic nuclear polarization (DNP) in a quantum Hall ferromagnet (QHF) is a highly sensitive method for the discovery of fascinating quantum Hall phases; however, the mechanism of this DNP and, in particular, the role of quantum Hall edge states in it are unclear. Here we demonstrate the important but previously unrecognized effect of chiral edge modes on the nuclear spin polarization. A side-by-side comparison of the RDNMR signals from Hall bar and Corbino disk configurations allows us to distinguish the contributions of bulk and edge states to DNP in QHF. The unidirectional current flow along chiral edge states makes the polarization robust to thermal fluctuations at high temperatures and makes it possible to observe a reciprocity principle of the RDNMR response. These findings help us better understand complex NMR responses in QHF, which has important implications for the development of RDNMR techniques.

Date: 2017
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DOI: 10.1038/ncomms15084

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