Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4935075
Keywords
-
Categories
Funding
- Japan Society for the Promotion of Science through the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program) on Quantum Science on Strong Correlation
- Council for Science and Technology Policy
- JSPS [24224009, 24226002]
- Grants-in-Aid for Scientific Research [13J07556] Funding Source: KAKEN
Ask authors/readers for more resources
Quantum anomalous Hall effect (QAHE), which generates dissipation-less edge current without external magnetic field, is observed in magnetic-ion doped topological insulators (TIs) such as Cr- and V-doped (Bi,Sb)(2)Te-3. The QAHE emerges when the Fermi level is inside the magnetically induced gap around the original Dirac point of the TI surface state. Although the size of gap is reported to be about 50 meV, the observable temperature of QAHE has been limited below 300 mK. We attempt magnetic-Cr modulation doping into topological insulator (Bi,Sb)(2)Te-3 films to increase the observable temperature of QAHE. By introducing the rich-Cr-doped thin (1 nm) layers at the vicinity of both the surfaces based on non-Cr-doped (Bi,Sb)(2)Te-3 films, we have succeeded in observing the QAHE up to 2K. The improvement in the observable temperature achieved by this modulation-doping appears to be originating from the suppression of the disorder in the surface state interacting with the rich magnetic moments. Such a superlattice designing of the stabilized QAHE may pave a way to dissipation-less electronics based on the higher-temperature and zero magnetic-field quantum conduction. (C) 2015 AIP Publishing LLC.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available