Abstract
A hexagonal deformation of the Fermi surface of has been for the first time observed by angle-resolved photoemission spectroscopy. This is in contrast to the general belief that possesses an ideal Dirac cone. The hexagonal shape is found to disappear near the Dirac node, which would protect the surface state electrons from backscattering. It is also demonstrated that the Fermi energy of naturally electron-doped can be tuned by 1% Mg doping in order to realize the quantum topological transport.
- Received 10 June 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.076802
© 2010 The American Physical Society
Synopsis
A flattened cone
Published 16 August 2010
Photoemission measurements challenge the picture that the electronic states on the surface of the topological insulator form a perfect Dirac cone.
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