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)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.
- Authors:
-
[6];
- The Univ. of Sydney, Sydney, NSW (Australia)
- The Univ. of Sydney, Sydney, NSW (Australia); Univ. of California, Berkeley, CA (United States)
- Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of California, Los Angeles, CA (United States); ShanghaiTech Univ., Shanghai (China)
- Univ. of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), 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. https://doi.org/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. https://doi.org/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 = {Tue Nov 28 00:00:00 EST 2017},
month = {Tue Nov 28 00:00:00 EST 2017}
}
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