Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-26
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 6 figures. Accepted for fast-track publication in Solid State Communications (2012)
Scientific paper
Scanning tunneling spectroscopic studies of Bi2Se3 epitaxial films on Si (111) substrates reveal highly localized unitary impurity resonances associated with non-magnetic quantum impurities. The strength of the resonances depends on the energy difference between the Fermi level ({E_F}) and the Dirac point ({E_D}) and diverges as {E_F} approaches {E_D}. The Dirac-cone surface state of the host recovers within ~ 2{\AA} spatial distance from impurities, suggesting robust topological protection of the surface state of topological insulators against high-density impurities that preserve time reversal symmetry.
Chu Haifeng
He Lixin
Teague M. L.
Wang Ke-Lin
Xiu F.-X.
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