TY - JOUR
T1 - Non-trivial surface states of samarium hexaboride at the (111) surface
AU - Ohtsubo, Yoshiyuki
AU - Yamashita, Yuki
AU - Hagiwara, Kenta
AU - Ideta, Shin ichiro
AU - Tanaka, Kiyohisa
AU - Yukawa, Ryu
AU - Horiba, Koji
AU - Kumigashira, Hiroshi
AU - Miyamoto, Koji
AU - Okuda, Taichi
AU - Hirano, Wataru
AU - Iga, Fumitoshi
AU - Kimura, Shin ichi
N1 - Funding Information:
The authors thank T. Nakamura, Y. Takeno and C. Wang for their support during general experiments. The authors acknowledge S. Wu for his support during the experiments on BL9B at HiSOR. Part of the ARPES measurements were performed under UVSOR Proposals 29-553 and 30-577, Photon Factory Proposals Nos. 2015G540 and 2017G537, and HiSOR Proposal No. 17AG017. This work was also supported by the JSPS KAKENHI (Grant Nos. JP15H03676, JP17K18757 and JP23244066).
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - The peculiar metallic electronic states observed in the Kondo insulator, samarium hexaboride (SmB6), has stimulated considerable attention among those studying non-trivial electronic phenomena. However, experimental studies of these states have led to controversial conclusions mainly due to the difficulty and inhomogeneity of the SmB6 crystal surface. Here, we show the detailed electronic structure of SmB6 with angle-resolved photoelectron spectroscopy measurements of the three-fold (111) surface where only two inequivalent time-reversal-invariant momenta (TRIM) exist. We observe the metallic two-dimensional state was dispersed across the bulk Kondo gap. Its helical in-plane spin polarisation around the surface TRIM indicates that SmB6 is topologically non-trivial, according to the topological classification theory for weakly correlated systems. Based on these results, we propose a simple picture of the controversial topological classification of SmB6.
AB - The peculiar metallic electronic states observed in the Kondo insulator, samarium hexaboride (SmB6), has stimulated considerable attention among those studying non-trivial electronic phenomena. However, experimental studies of these states have led to controversial conclusions mainly due to the difficulty and inhomogeneity of the SmB6 crystal surface. Here, we show the detailed electronic structure of SmB6 with angle-resolved photoelectron spectroscopy measurements of the three-fold (111) surface where only two inequivalent time-reversal-invariant momenta (TRIM) exist. We observe the metallic two-dimensional state was dispersed across the bulk Kondo gap. Its helical in-plane spin polarisation around the surface TRIM indicates that SmB6 is topologically non-trivial, according to the topological classification theory for weakly correlated systems. Based on these results, we propose a simple picture of the controversial topological classification of SmB6.
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U2 - 10.1038/s41467-019-10353-3
DO - 10.1038/s41467-019-10353-3
M3 - Article
C2 - 31127112
AN - SCOPUS:85066956480
VL - 10
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 2298
ER -