Zero-field edge plasmons in a magnetic topological insulator

Alice C. Mahoney, James I. Colless, Lucas Peeters, Sebastian J. Pauka, Eli J. Fox, Xufeng Kou, Lei Pan, Kang L. Wang, David Goldhaber-Gordon, David J. Reilly

研究成果: Article同行評審

25 引文 斯高帕斯(Scopus)

摘要

Incorporating ferromagnetic dopants into three-dimensional topological insulator thin films has recently led to the realisation of the quantum anomalous Hall effect. These materials are of great interest since they may support electrical currents that flow without resistance, even at zero magnetic field. To date, the quantum anomalous Hall effect has been investigated using low-frequency transport measurements. However, transport results can be difficult to interpret due to the presence of parallel conductive paths, or because additional non-chiral edge channels may exist. Here we move beyond transport measurements by probing the microwave response of a magnetised disk of Cr-(Bi,Sb)2Te3. We identify features associated with chiral edge plasmons, a signature that robust edge channels are intrinsic to this material system. Our results provide a measure of the velocity of edge excitations without contacting the sample, and pave the way for an on-chip circuit element of practical importance: the zero-field microwave circulator.

原文English
文章編號1836
期刊Nature communications
8
發行號1
DOIs
出版狀態Published - 2017 12月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 生物化學、遺傳與分子生物學 (全部)
  • 物理與天文學 (全部)

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