Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.146803
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [24224009, 24540338, 26103006]
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [26103006, 24540338] Funding Source: KAKEN
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Three-dimensional topological insulators of finite thickness can show the quantum Hall effect (QHE) at the filling factor nu = 0 under an external magnetic field if there is a finite potential difference between the top and bottom surfaces. We calculate energy spectra of surface Weyl fermions in the nu = 0 QHE and find that gapped edge states with helical spin structure are formed from Weyl fermions on the side surfaces under certain conditions. These edge channels account for the nonlocal charge transport in the nu = 0 QHE which is observed in a recent experiment on (Bi1-xSbx)(2)Te-3 films. The edge channels also support spin transport due to the spin-momentum locking. We propose an experimental setup to observe various spintronics functions such as spin transport and spin conversion.
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