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

Di S. Wei, Toeno Van Der Sar, Seung Hwan Lee, Kenji Watanabe, Takashi Taniguchi, Bertrand I. Halperin, Amir Yacoby

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalScience
Volume362
Issue number6411
DOIs
Publication statusPublished - 2018
Externally publishedYes

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