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Surface and bulk electronic structure of the strongly correlated system SmB_{6} and implications for a topological Kondo insulator
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Xu, N., Shi, X., Biswas, P. K., Matt, C. E., Dhaka, R. S., Huang, Y., Plumb, N. C., Radović, M., Dil, J. H., Pomjakushina, E., Conder, K., Amato, A., Salman, Zaher, Paul, Don McK., Mesot, J., Ding, H. and Shi, M. (2013) Surface and bulk electronic structure of the strongly correlated system SmB_{6} and implications for a topological Kondo insulator. Physical Review B (Condensed Matter and Materials Physics), Volume 88 (Number 12). Article number 121102. doi:10.1103/PhysRevB.88.121102 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.88.121102
Abstract
Recent theoretical calculations and experimental results suggest that the strongly correlated material SmB6 may be a realization of a topological Kondo insulator. We have performed an angle-resolved photoemission spectroscopy study on SmB6 in order to elucidate elements of the electronic structure relevant to the possible occurrence of a topological Kondo insulator state. The obtained electronic structure in the whole three-dimensional momentum space reveals one electron-like 5d bulk band centered at the X point of the bulk Brillouin zone that is hybridized with strongly correlated f electrons, as well as the opening of a Kondo band gap (ΔB ∼ 20 meV) at low temperature. In addition, we observe electron-like bands forming three Fermi surfaces at the center Γ̅ point and boundary X̅ point of the surface Brillouin zone. These bands are not expected from calculations of the bulk electronic structure, and their observed dispersion characteristics are consistent with surface states. Our results suggest that the unusual low-temperature transport behavior of SmB6 is likely to be related to the pronounced surface states sitting inside the band hybridization gap and/or the presence of a topological Kondo insulating state.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 15 September 2013 | ||||
Dates: |
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Volume: | Volume 88 | ||||
Number: | Number 12 | ||||
Page Range: | Article number 121102 | ||||
DOI: | 10.1103/PhysRevB.88.121102 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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