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Title: Zero-field edge plasmons in a magnetic topological insulator [Zero-field edge magnetoplasmons in a magnetic topological insulator]

Abstract

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) 2Te 3. We identify features associated with chiral edge plasmons, a signature that robust edge channels are intrinsic to this material system. Finally, 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.

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [6]; ORCiD logo [6];  [4];  [1]
  1. The Univ. of Sydney, Sydney, NSW (Australia)
  2. The Univ. of Sydney, Sydney, NSW (Australia); Univ. of California, Berkeley, CA (United States)
  3. Stanford Univ., Stanford, CA (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Univ. of California, Los Angeles, CA (United States); ShanghaiTech Univ., Shanghai (China)
  6. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1419654
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Mahoney, Alice C., Colless, James I., Peeters, Lucas, Pauka, Sebastian J., Fox, Eli J., Kou, Xufeng, Pan, Lei, Wang, Kang L., Goldhaber-Gordon, David, and Reilly, David J. Zero-field edge plasmons in a magnetic topological insulator [Zero-field edge magnetoplasmons in a magnetic topological insulator]. United States: N. p., 2017. Web. doi:10.1038/s41467-017-01984-5.
Mahoney, Alice C., Colless, James I., Peeters, Lucas, Pauka, Sebastian J., Fox, Eli J., Kou, Xufeng, Pan, Lei, Wang, Kang L., Goldhaber-Gordon, David, & Reilly, David J. Zero-field edge plasmons in a magnetic topological insulator [Zero-field edge magnetoplasmons in a magnetic topological insulator]. United States. doi:10.1038/s41467-017-01984-5.
Mahoney, Alice C., Colless, James I., Peeters, Lucas, Pauka, Sebastian J., Fox, Eli J., Kou, Xufeng, Pan, Lei, Wang, Kang L., Goldhaber-Gordon, David, and Reilly, David J. Tue . "Zero-field edge plasmons in a magnetic topological insulator [Zero-field edge magnetoplasmons in a magnetic topological insulator]". United States. doi:10.1038/s41467-017-01984-5. https://www.osti.gov/servlets/purl/1419654.
@article{osti_1419654,
title = {Zero-field edge plasmons in a magnetic topological insulator [Zero-field edge magnetoplasmons in a magnetic topological insulator]},
author = {Mahoney, Alice C. and Colless, James I. and Peeters, Lucas and Pauka, Sebastian J. and Fox, Eli J. and Kou, Xufeng and Pan, Lei and Wang, Kang L. and Goldhaber-Gordon, David and Reilly, David J.},
abstractNote = {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. Finally, 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.},
doi = {10.1038/s41467-017-01984-5},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {11}
}

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