Observation of possible topological in-gap surface states in the Kondo insulator SmB6 by photoemission

Jiang, J.; Li, S.; Zhang, T.; Sun, Z.; Chen, F.; Ye, Z. R.; Xu, M.; Ge, Q. Q.; Tan, S. Y.; Niu, X. H.; Xia, M.; Xie, B. P.; Li, Y. F.; Chen, X. H.; Wen, H. H.; Feng, D. L.

doi:10.1038/ncomms4010

Observation of possible topological in-gap surface states in the Kondo insulator SmB₆ by photoemission

Journal Article · Tue Dec 17 23:00:00 EST 2013 · Nature Communications

DOI:https://doi.org/10.1038/ncomms4010· OSTI ID:1623931

Jiang, J. ^[1]; Li, S. ^[2]; Zhang, T. ^[3]; Sun, Z. ^[4]; Chen, F. ^[4]; Ye, Z. R. ^[3]; Xu, M. ^[3]; Ge, Q. Q. ^[3]; Tan, S. Y. ^[3]; Niu, X. H. ^[3]; Xia, M. ^[3]; Xie, B. P. ^[3]; Li, Y. F. ^[2]; Chen, X. H. ^[4]; Wen, H. H. ^[2]; Feng, D. L. ^[3]

Fudan Univ., Shanghai (China); DOE/OSTI
Nanjing Univ. (China)
Fudan Univ., Shanghai (China)
University of Science and Technology of China, Hefei (China)

SmB₆, a well-known Kondo insulator, exhibits a transport anomaly at low temperature. This anomaly is usually attributed to states within the hybridization gap. Recent theoretical work and transport measurements suggest that these in-gap states could be ascribed to topological surface states, which would make SmB6 the first realization of topological Kondo insulator. Here by performing angle-resolved photoemission spectroscopy experiments, we directly observe several dispersive states within the hybridization gap of SmB₆. These states show negligible k_z dependence, which indicates their surface origin. Furthermore, we perform photoemission circular dichroism experiments, which suggest that the in-gap states possess chirality of the orbital angular momentum. These states vanish simultaneously with the hybridization gap at around 150 K. Together, these observations suggest the possible topological origin of the in-gap states.

View Accepted Manuscript (DOE)

Research Organization:: Fudan Univ., Shanghai (China)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

OSTI ID:: 1623931

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 4; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Observation of the Superconducting Proximity Effect in the Surface State of SmB 6 Thin Films Lee, Seunghun; Zhang, Xiaohang; Liang, Yangang Physical Review X, Vol. 6, Issue 3 https://doi.org/10.1103/physrevx.6.031031	journal	August 2016
Heavy Weyl Fermion State in CeRu 4 Sn 6 Xu, Yuanfeng; Yue, Changming; Weng, Hongming Physical Review X, Vol. 7, Issue 1 https://doi.org/10.1103/physrevx.7.011027	journal	March 2017
Colloquium : Topological band theory Bansil, A.; Lin, Hsin; Das, Tanmoy Reviews of Modern Physics, Vol. 88, Issue 2 https://doi.org/10.1103/revmodphys.88.021004	journal	June 2016
Two-dimensional Fermi surfaces in Kondo insulator SmB ₆ Li, G.; Xiang, Z.; Yu, F. Science, Vol. 346, Issue 6214 https://doi.org/10.1126/science.1250366	journal	December 2014
$4f$ Crystal Field Ground State of the Strongly Correlated Topological Insulator $SmB_{6}$ Sundermann, M.; Yavaş, H.; Chen, K. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-00193	text	January 2018
Inorganic Boron-Based Nanostructures: Synthesis, Optoelectronic Properties, and Prospective Applications Tian, Yan; Guo, Zekun; Zhang, Tong Nanomaterials, Vol. 9, Issue 4 https://doi.org/10.3390/nano9040538	journal	April 2019
Topological invariants, surface states, and interaction-driven phase transitions in correlated Kondo insulators with cubic symmetry Legner, Markus; Rüegg, Andreas; Sigrist, Manfred arXiv https://doi.org/10.48550/arxiv.1312.3639	text	January 2013
Surface Theory of a Family of Topological Kondo Insulators Roy, Bitan; Sau, Jay D.; Dzero, Maxim arXiv https://doi.org/10.48550/arxiv.1405.5526	text	January 2014
Two-dimensional heavy fermions on the strongly correlated boundaries of Kondo topological insulators Nikolić, Predrag arXiv https://doi.org/10.48550/arxiv.1407.4482	text	January 2014
Spin Injection and Inverse Edelstein Effect in the Surface States of Topological Kondo Insulator SmB6 Song, Qi; Mi, Jian; Zhao, Dan arXiv https://doi.org/10.48550/arxiv.1610.00856	text	January 2016
Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields Wolgast, S.; Eo, Y. S.; Sun, K. arXiv https://doi.org/10.48550/arxiv.1610.07721	text	January 2016
Additional energy scale in SmB$_6$ at low temperature Jiao, Lin; Rößler, Sahana; Kim, D. J. arXiv https://doi.org/10.48550/arxiv.1701.02949	text	January 2017
Skyrme insulators: insulators at the brink of superconductivity Erten, Onur; Chang, Po-Yao; Coleman, Piers arXiv https://doi.org/10.48550/arxiv.1701.06582	text	January 2017
Tunable Electronic Structure and Surface States in Rare Earth Mono-Bismuthides with Partially Filled f Shell Li, Peng; Wu, Zhongzheng; Wu, Fan arXiv https://doi.org/10.48550/arxiv.1802.03111	text	January 2018
Interacting topological insulators: a review Rachel, Stephan arXiv https://doi.org/10.48550/arxiv.1804.10656	text	January 2018
Investigation of high-temperature bulk transport characteristics and skew scattering in samarium hexaboride Rakoski, Alexa; Eo, Yun Suk; Kurdak, Çağlıyan arXiv https://doi.org/10.48550/arxiv.1907.09436	preprint	January 2019
Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g-SmS Kang, Chang-Jong; Ryu, Dong-Choon; Kim, Junwon arXiv https://doi.org/10.48550/arxiv.1908.05565	text	January 2019

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