Electrical generation and detection of spin waves in a quantum Hall ferromagnet

Wei, Di S.; van der Sar, Toeno; Lee, Seung Hwan; Watanabe, Kenji; Taniguchi, Takashi; Halperin, Bertrand I.; Yacoby, Amir

doi:10.1126/science.aar4061

Title: Electrical generation and detection of spin waves in a quantum Hall ferromagnet

Journal Article · 10 October 2018 · Science

DOI: https://doi.org/10.1126/science.aar4061 · OSTI ID:1477144

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; Taniguchi, Takashi;

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Spin waves are collective excitations of magnetic systems. An attractive setting for studying long-lived spin-wave physics is the quantum Hall (QH) ferromagnet, which forms spontaneously in clean two-dimensional electron systems at low temperature and in a perpendicular magnetic field. We used out-of-equilibrium occupation of QH edge channels in graphene to excite and detect spin waves in magnetically ordered QH states. Our experiments provide direct evidence for long-distance spin-wave propagation through different ferromagnetic phases in the N = 0 Landau level, as well as across the insulating canted antiferromagnetic phase. Our results will enable experimental investigation of the fundamental magnetic properties of these exotic two-dimensional electron systems.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0001819

OSTI ID:: 1477144

Journal Information:: Science, Journal Name: Science Journal Issue: 6411 Vol. 362; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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