Dynamic nuclear polarization and nuclear magnetic resonance in the simplest pseudospin quantum Hall ferromagnet

Hongwu Liu; Kaifeng Yang; T. D. Mishima; M. B. Santos; Y. Hirayama

doi:10.1103/PhysRevB.82.241304

Dynamic nuclear polarization and nuclear magnetic resonance in the simplest pseudospin quantum Hall ferromagnet

Hongwu Liu, Kaifeng Yang, T. D. Mishima, M. B. Santos, Y. Hirayama

SCI - Physics

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

We present dynamic nuclear polarization (DNP) in the simplest pseudospin quantum Hall ferromagnet (QHF) of an InSb two-dimensional electron gas with a large g factor using tilted magnetic fields. The DNP-induced amplitude change in a resistance spike of the QHF at large current enables observation of the resistively detected nuclear magnetic resonance of the high nuclear spin isotope I 115 n with nine quadrupole splittings. Our results demonstrate the importance of domain structures in the DNP process. The nuclear spin relaxation time T₁ in this QHF was relatively short (∼120s) and almost temperature independent.

Original language	English
Article number	241304
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.82.241304
Publication status	Published - 2010 Dec 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We present dynamic nuclear polarization (DNP) in the simplest pseudospin quantum Hall ferromagnet (QHF) of an InSb two-dimensional electron gas with a large g factor using tilted magnetic fields. The DNP-induced amplitude change in a resistance spike of the QHF at large current enables observation of the resistively detected nuclear magnetic resonance of the high nuclear spin isotope I 115 n with nine quadrupole splittings. Our results demonstrate the importance of domain structures in the DNP process. The nuclear spin relaxation time T1 in this QHF was relatively short (∼120s) and almost temperature independent.",

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AU - Liu, Hongwu

AU - Yang, Kaifeng

AU - Mishima, T. D.

AU - Santos, M. B.

AU - Hirayama, Y.

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AB - We present dynamic nuclear polarization (DNP) in the simplest pseudospin quantum Hall ferromagnet (QHF) of an InSb two-dimensional electron gas with a large g factor using tilted magnetic fields. The DNP-induced amplitude change in a resistance spike of the QHF at large current enables observation of the resistively detected nuclear magnetic resonance of the high nuclear spin isotope I 115 n with nine quadrupole splittings. Our results demonstrate the importance of domain structures in the DNP process. The nuclear spin relaxation time T1 in this QHF was relatively short (∼120s) and almost temperature independent.

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