Zero-field edge plasmons in a magnetic topological insulator
Mahoney, Alice C.1; Colless, James I.1,6; Peeters, Lucas2; Pauka, Sebastian J.1; Fox, Eli J.2,3; Kou, Xufeng4,7; Pan, Lei4; Wang, Kang L.4; Goldhaber-Gordon, David2,3; Reilly, David J.1,5
AbstractIncorporating 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)(2)Te-3. 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.
Indexed BySCI
Funding ProjectGordon and Betty Moore Foundation[GBMF3429]
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000416399700009
Original Document TypeArticle
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Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGoldhaber-Gordon, David; Reilly, David J.
Affiliation1.Univ Sydney, ARC Ctr Excellence Engn Quantum Syst, Sch Phys, Sydney, NSW 2006, Australia
2.Stanford Univ, Dept Phys, Stanford, CA 94305 USA
3.SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA
4.Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA
5.Microsoft Stn Q Sydney, Sydney, NSW 2006, Australia
6.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
7.ShanghaiTech Univ, Sch Informat Sci & Technol, Shanghai 201210, Peoples R China
Recommended Citation
GB/T 7714
Mahoney, Alice C.,Colless, James I.,Peeters, Lucas,et al. Zero-field edge plasmons in a magnetic topological insulator[J]. NATURE COMMUNICATIONS,2017,8.
APA Mahoney, Alice C..,Colless, James I..,Peeters, Lucas.,Pauka, Sebastian J..,Fox, Eli J..,...&Reilly, David J..(2017).Zero-field edge plasmons in a magnetic topological insulator.NATURE COMMUNICATIONS,8.
MLA Mahoney, Alice C.,et al."Zero-field edge plasmons in a magnetic topological insulator".NATURE COMMUNICATIONS 8(2017).
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