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

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.

doi:10.1038/s41467-017-01984-5

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

Journal Article · Tue Nov 28 00:00:00 EST 2017 · Nature Communications

DOI:https://doi.org/10.1038/s41467-017-01984-5· OSTI ID:1419654

Mahoney, Alice C. ^[1]; Colless, James I. ^[2]; Peeters, Lucas ^[3]; Pauka, Sebastian J. ^[1]; Fox, Eli J. ^[4]; Kou, Xufeng ^[5]; Pan, Lei ^[6];

^[6]; Goldhaber-Gordon, David ^[4]; Reilly, David J. ^[1]

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)

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1419654

Journal Information:: Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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