RT Journal Article
SR Electronic
T1 Magnetic and defect probes of the SmB_{6} surface state
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaau4886
DO 10.1126/sciadv.aau4886
VO 4
IS 11
A1 Jiao, Lin
A1 Rößler, Sahana
A1 Kasinathan, Deepa
A1 Rosa, Priscila F. S.
A1 Guo, Chunyu
A1 Yuan, Huiqiu
A1 Liu, Chao-Xing
A1 Fisk, Zachary
A1 Steglich, Frank
A1 Wirth, Steffen
YR 2018
UL http://advances.sciencemag.org/content/4/11/eaau4886.abstract
AB The impact of nonmagnetic and magnetic impurities on topological insulators is a central focus concerning their fundamental physics and possible spintronics and quantum computing applications. Combining scanning tunneling spectroscopy with transport measurements, we investigate, both locally and globally, the effect of nonmagnetic and magnetic substituents in SmB6, a predicted topological Kondo insulator. Around the so-introduced substitutents and in accord with theoretical predictions, the surface states are locally suppressed with different length scales depending on the substituent’s magnetic properties. For sufficiently high substituent concentrations, these states are globally destroyed. Similarly, using a magnetic tip in tunneling spectroscopy also resulted in largely suppressed surface states. Hence, a destruction of the surface states is always observed close to atoms with substantial magnetic moment. This points to the topological nature of the surface states in SmB6 and illustrates how magnetic impurities destroy the surface states from microscopic to macroscopic length scales.