Teague, M. L. and Chu, H. and Xiu, F.-X. and He, L. and Wang, K.-L. and Yeh, N.-C. (2012) Observation of Fermi-energy dependent unitary impurity resonances in a strong topological insulator Bi_2Se_3 with scanning tunneling spectroscopy. Solid State Communications, 152 (9). pp. 747-751. ISSN 0038-1098 http://resolver.caltech.edu/CaltechAUTHORS:20120206-081319138
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Scanning tunneling spectroscopic studies of Bi_2Se_3 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 ~ 2Å spatial distance from impurities, suggesting robust topological protection of the surface state of topological insulators against high-density impurities that preserve time reversal symmetry.
|Additional Information:||© 2012 Elsevier Ltd. Received 16 January 2012. Accepted 26 January 2012 by A. Pinczuk. Available online 1 February 2012. This work at Caltech was jointly supported by the Center on Functional Engineered Nano Architectonics (FENA), the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation, and the Kavli Foundation through the Kavli Nanoscience Institute (KNI) at Caltech. The work at UCLA was supported by FENA. We thank K. Sengupta and A. V. Balatsky for valuable discussion.|
|Group:||IQIM, Institute for Quantum Information and Matter, Kavli Nanoscience Institute|
|Subject Keywords:||topological insulators; Dirac fermions; impurity resonances; scanning tunneling spectroscopy|
|Classification Code:||PACS: 73.20.-r, 68.37.Ef, 72.10.Fk|
|Official Citation:||M.L. Teague, H. Chu, F.-X. Xiu, L. He, K.-L. Wang, N.-C. Yeh, Observation of Fermi-energy dependent unitary impurity resonances in a strong topological insulator Bi2Se3 with scanning tunneling spectroscopy, Solid State Communications, Volume 152, Issue 9, May 2012, Pages 747-751, ISSN 0038-1098, 10.1016/j.ssc.2012.01.041.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||25 Apr 2012 17:10|
|Last Modified:||26 Dec 2012 14:47|
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