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28 March 2024 |
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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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