Importance of charge fluctuations for the topological phase in SmB6

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Title
Importance of charge fluctuations for the topological phase in SmB6
Author(s)
Chul-Hee Min; Lutz P.; Fiedler S.; Boyoun Kang; Beongki Cho; Hyeong-Do Kim; Bentmann H.; Reinert F.
Publication Date
2014-06
Journal
PHYSICAL REVIEW LETTERS, v.112, no.22, pp.226402 -
Publisher
AMER PHYSICAL SOC
Abstract
Typical Kondo insulators (KIs) can have a nontrivial Z2 topology because the energy gap opens at the Fermi energy (EF) by a hybridization between odd- and even-parity bands. SmB6 deviates from such KI behavior, and it has been unclear how the insulating phase occurs. Here, we demonstrate that charge fluctuations are the origin of the topological insulating phase in SmB6. Our angle-resolved photoemission spectroscopy results reveal that with decreasing temperature the bottom of the d-f hybridized band at the X̄ point, which is predicted to have odd parity and is required for a topological phase, gradually shifts from below to above EF. We conclude that SmB6 is a charge-fluctuating topological insulator. © 2014 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/1013
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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