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

Abstract

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.


Citation Formats

Wei, Di S., van der Sar, Toeno, Lee, Seung Hwan, Watanabe, Kenji, Taniguchi, Takashi, Halperin, Bertrand I., and Yacoby, Amir. Electrical generation and detection of spin waves in a quantum Hall ferromagnet. United States: N. p., 2018. Web. doi:10.1126/science.aar4061.
Wei, Di S., van der Sar, Toeno, Lee, Seung Hwan, Watanabe, Kenji, Taniguchi, Takashi, Halperin, Bertrand I., & Yacoby, Amir. Electrical generation and detection of spin waves in a quantum Hall ferromagnet. United States. doi:10.1126/science.aar4061.
Wei, Di S., van der Sar, Toeno, Lee, Seung Hwan, Watanabe, Kenji, Taniguchi, Takashi, Halperin, Bertrand I., and Yacoby, Amir. Thu . "Electrical generation and detection of spin waves in a quantum Hall ferromagnet". United States. doi:10.1126/science.aar4061.
@article{osti_1477144,
title = {Electrical generation and detection of spin waves in a quantum Hall ferromagnet},
author = {Wei, Di S. and van der Sar, Toeno and Lee, Seung Hwan and Watanabe, Kenji and Taniguchi, Takashi and Halperin, Bertrand I. and Yacoby, Amir},
abstractNote = {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.},
doi = {10.1126/science.aar4061},
journal = {Science},
number = 6411,
volume = 362,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
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DOI: 10.1126/science.aar4061

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