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

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.

Authors:
 [1];  [2];  [2];  [2];  [3];  [4];  [5]; ORCiD logo [2]
  1. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
  2. Pohang Univ. of Science and Technology, Pohang (Korea)
  3. Catholic Univ. of Korea, Bucheon (Korea)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566818
Alternate Identifier(s):
OSTI ID: 1557388
Report Number(s):
BNL-212101-2019-JAAM
Journal ID: ISSN 2475-9953; PRMHAR
Grant/Contract Number:  
SC0012704; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 8; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kang, Chang-Jong, Ryu, Dong-Choon, Kim, Junwon, Kim, Kyoo, Kang, J. -S., Denlinger, J. D., Kotliar, G., and Min, B. I. Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g -SmS. United States: N. p., 2019. Web. doi:10.1103/PhysRevMaterials.3.081201.
Kang, Chang-Jong, Ryu, Dong-Choon, Kim, Junwon, Kim, Kyoo, Kang, J. -S., Denlinger, J. D., Kotliar, G., & Min, B. I. Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g -SmS. United States. doi:10.1103/PhysRevMaterials.3.081201.
Kang, Chang-Jong, Ryu, Dong-Choon, Kim, Junwon, Kim, Kyoo, Kang, J. -S., Denlinger, J. D., Kotliar, G., and Min, B. I. Thu . "Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g -SmS". United States. doi:10.1103/PhysRevMaterials.3.081201.
@article{osti_1566818,
title = {Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g -SmS},
author = {Kang, Chang-Jong and Ryu, Dong-Choon and Kim, Junwon and Kim, Kyoo and Kang, J. -S. and Denlinger, J. D. and Kotliar, G. and Min, B. I.},
abstractNote = {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.},
doi = {10.1103/PhysRevMaterials.3.081201},
journal = {Physical Review Materials},
number = 8,
volume = 3,
place = {United States},
year = {2019},
month = {8}
}

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