Zero-Field Dissipationless Chiral Edge Transport and the Nature of Dissipation in the Quantum Anomalous Hall State
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PhysRevLett.115.057206.pdf
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Author(s)
Zhao, Weiwei
Kim, Duk Y.
Wei, Peng
Jain, J. K.
Liu, Chaoxing
Chan, Moses H. W.
Chang, Cui-zu
Moodera, Jagadeesh
Date Issued
July 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Chang, Cui-Zu, Weiwei Zhao, Duk Y. Kim, Peng Wei, J. K. Jain, Chaoxing Liu, Moses H. W. Chan, and Jagadeesh S. Moodera. “Zero-Field Dissipationless Chiral Edge Transport and the Nature of Dissipation in the Quantum Anomalous Hall State.” Physical Review Letters 115, no. 5 (July 2015). © 2015 American Physical Society
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Final published version
Abstract
The quantum anomalous Hall (QAH) effect is predicted to possess, at a zero magnetic field, chiral edge channels that conduct a spin polarized current without dissipation. While edge channels have been observed in previous experimental studies of the QAH effect, their dissipationless nature at a zero magnetic field has not been convincingly demonstrated. By a comprehensive experimental study of the gate and temperature dependences of local and nonlocal magnetoresistance, we unambiguously establish the dissipationless edge transport. By studying the onset of dissipation, we also identify the origin of dissipative channels and clarify the surprising observation that the critical temperature of the QAH effect is 2 orders of magnitude smaller than the Curie temperature of ferromagnetism.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.115.057206
