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Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g-SmS

Chang-Jong Kang, Dong-Choon Ryu, Junwon Kim, Kyoo Kim, J.-S. Kang, J. D. Denlinger, G. Kotliar, and B. I. Min
Phys. Rev. Materials 3, 081201(R) – Published 15 August 2019

Abstract

We demonstrate theoretically that the golden phase of SmS (g-SmS), a correlated mixed-valent system, exhibits nontrivial surface states with diverse topology. It turns out that this material is an ideal playground to investigate different band topologies in different surface terminations. We have explored surface states on three different (001), (111), and (110) surface terminations. The topological signature on the (001) surface is not apparent due to a hidden Dirac cone inside the bulk-projected bands. In contrast, the (111) surface shows a clear gapless Dirac cone in the gap region, demonstrating the unambiguous topological Kondo nature of g-SmS. Most interestingly, the (110) surface exhibits both topological-insulator-type and topological-crystalline-insulator (TCI)-type surface states simultaneously. Two different types of double Dirac cones, Rashba-type and TCI-type, realized on the (001) and (110) surfaces, respectively, are analyzed with the mirror eigenvalues and mirror Chern numbers obtained from the model-independent ab initio band calculations.

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  • Received 9 June 2019

DOI:https://doi.org/10.1103/PhysRevMaterials.3.081201

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Chang-Jong Kang1,*, Dong-Choon Ryu2,*, Junwon Kim2, Kyoo Kim2,3, J.-S. Kang4, J. D. Denlinger5, G. Kotliar1,6, and B. I. Min2,†

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  • 2Department of Physics, Pohang University of Science and Technology, Pohang 37673, Korea
  • 3MPPHC_CPM, Pohang University of Science and Technology, Pohang 37673, Korea
  • 4Department of Physics, The Catholic University of Korea, Bucheon 14662, Korea
  • 5Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA
  • 6Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA

  • *C.-J.K. and D.-C.R. contributed equally to this work.
  • Corresponding author: bimin@postech.ac.kr

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Issue

Vol. 3, Iss. 8 — August 2019

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