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28 March 2024
 
  » arxiv » 1505.1896

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Zero-field dissipationless chiral edge transport and the nature of dissipation in the quantum anomalous Hall state
Cui-Zu Chang ; Weiwei Zhao ; Duk Y. Kim ; Peng Wei ; J. K. Jain ; Chaoxing Liu ; Moses H. W. Chan ; Jagadeesh S. Moodera ;
Date 8 May 2015
AbstractThe quantum anomalous Hall (QAH) effect is predicted to possess, at zero magnetic field, chiral edge channels that conduct spin polarized current without dissipation and thus hold great promise for future high-performance information processing. While edge channels have been observed in previous experimental studies of the QAH effect, their dissipationless nature at zero magnetic field has not been convincingly demonstrated and the nature of dissipation has also not been clarified. The recent observation of a QAH state with negligible dissipation in V-doped (Bi,Sb)2Te3 films has allowed us, by an experimental study of the gate and temperature dependences of local and nonlocal magnetoresistance, to 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 two orders of magnitude smaller than the Curie temperature of ferromagnetism in this system. The confirmation of dissipationless transport by edge channels and the identification of dissipative channels in the quantum anomalous Hall effect will be crucial for future chiral interconnected electric and spintronic applications.
Source arXiv, 1505.1896
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