@article{21fe2e90ea42414c809fc3b501f4ae95,
title = "Surface electronic structure of the topological Kondo-insulator candidate correlated electron system SmB6",
abstract = "The Kondo insulator SmB6 has long been known to exhibit low-temperature transport anomalies whose origin is of great interest. Here we uniquely access the surface electronic structure of the anomalous transport regime by combining state-of-the-art laser and synchrotron-based angle-resolved photoemission techniques. We observe clear in-gap states (up to ∼4 meV), whose temperature dependence is contingent on the Kondo gap formation. In addition, our observed in-gap Fermi surface oddness tied with the Kramers' point topology, their coexistence with the two-dimensional transport anomaly in the Kondo hybridization regime, as well as their robustness against thermal recycling, taken together, collectively provide strong evidence for protected surface metallicity with a Fermi surface whose topology is consistent with the theoretically predicted topological Fermi surface. Our observations of systematic surface electronic structure provide the fundamental electronic parameters for the anomalous Kondo ground state of correlated electron material SmB6.",
author = "M. Neupane and N. Alidoust and Xu, {S. Y.} and T. Kondo and Y. Ishida and Kim, {D. J.} and Chang Liu and I. Belopolski and Jo, {Y. J.} and Chang, {T. R.} and Jeng, {H. T.} and T. Durakiewicz and L. Balicas and H. Lin and A. Bansil and S. Shin and Z. Fisk and Hasan, {M. Z.}",
note = "Funding Information: We thank P. W. Anderson, G. Bian, V. Galitski and D. Haldane for discussion. The work at Princeton and Princeton-led synchrotron X-ray-based measurements and the related theory at Northeastern University are supported by the Office of Basic Energy Sciences, US Department of Energy (Grants DE-FG-02-05ER46200, AC03-76SF00098 and DE-FG02-07ER46352). S.S. at ISSP acknowledges support from KAKENHI Grants number 23740256 and 2474021. T.D. at LANL acknowledges support from the Department of Energy, Office of Basic Energy Sciences, Division of Material Sciences and LANL LDRD program. We also thank M. Hashimoto, S.-K. Mo and A. Fedorov for beamline assistance at the DOE supported Stanford Synchrotron Radiation Lightsource and the Advanced Light Source in Berkeley. M.Z.H. acknowledges Visiting Scientist support from LBNL, Princeton University and the A.P. Sloan Foundation. T.-R.C. and H.-T.J. are supported by the National Science Council, Taiwan. L.B. is supported by DOE-BEZ through award DE-SC0002613. Publisher Copyright: {\textcopyright} 2013 Macmillan Publishers Limited. All rights reserved.",
year = "2013",
month = dec,
day = "18",
doi = "10.1038/ncomms3991",
language = "English (US)",
volume = "4",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
}