Robust Surface States and Coherence Phenomena in Magnetically Alloyed SmB6

Lin Miao, Chul Hee Min, Yishuai Xu, Zengle Huang, Erica C. Kotta, Rourav Basak, M. S. Song, B. Y. Kang, B. K. Cho, K. Kißner, F. Reinert, Turgut Yilmaz, Elio Vescovo, Yi De Chuang, Weida Wu, Jonathan D. Denlinger, L. Andrew Wray

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Samarium hexaboride is a candidate for the topological Kondo insulator state, in which Kondo coherence is predicted to give rise to an insulating gap spanned by topological surface states. Here we investigate the surface and bulk electronic properties of magnetically alloyed Sm1-xMxB6 (M=Ce, Eu), using angle-resolved photoemission spectroscopy and complementary characterization techniques. Remarkably, topologically nontrivial bulk and surface band structures are found to persist in highly modified samples with up to 30% Sm substitution and with an antiferromagnetic ground state in the case of Eu doping. The results are interpreted in terms of a hierarchy of energy scales, in which surface state emergence is linked to the formation of a direct Kondo gap, while low-temperature transport trends depend on the indirect gap.

Original languageEnglish (US)
Article number136401
JournalPhysical review letters
Volume126
Issue number13
DOIs
StatePublished - Mar 31 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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