J. Phys. Soc. Jpn. 83, 014705 (2014) [6 Pages]
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Spin-Polarized Angle-Resolved Photoelectron Spectroscopy of the So-Predicted Kondo Topological Insulator SmB6

Shigemasa Suga1,2,, Kazuyuki Sakamoto3, Taichi Okuda4, Koji Miyamoto4, Kenta Kuroda5, Akira Sekiyama6, Junichi Yamaguchi6, Hidenori Fujiwara6, Akinori Irizawa1, Takahiro Ito7,, Shinichi Kimura7,, T. Balashov8, W. Wulfhekel8, S. Yeo9, Fumitoshi Iga10, and Shin Imada11
+ Affiliations
1Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan2Max-Planck-Institute for Microstructure Physics, Weinberg 2, Halle 06120, Germany3Department of Nanomaterials Science, Chiba University, Chiba 263-8522, Japan4Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan5Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan6Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan7UVSOR, Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan8Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany9Korea Atomic Energy Research Institute, Daejeon 305-600, Republic of Korea10Faculty of Science, Ibaraki University, Mito 310-0056, Japan11Department of Physical Sciences, College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
Received September 4, 2013; Accepted October 22, 2013; Published December 10, 2013

Undoped and slightly Eu-doped SmB6 samples show the opening of a gap with decreasing temperature below ~150 K. The spectral shapes near the Fermi level (EF) at 15 K have shown a marked increase in intensity of the peak at a binding energy (EB) of approximately 12 meV with decreasing photon energy (hν) from 17 to 7 eV. Angle-resolved spectra of SmB6 measured at hν = 35 eV just after the in situ cleavage showed clear dispersions of several bands in the EB region from EF to 4 eV. Spin-polarized photoelectron spectra were then measured at 12 K and a light incidence angle of ~50°. In contrast to the lack of spin polarization for the linearly polarized light excitation, clear spin polarization was observed in the case of circularly polarized light excitation. The two prominent peaks at EB ~ 12 and ~150 meV have shown opposite signs of spin polarization which are reversed when the helicity of the light is reversed. The sign and magnitude of spin polarization are consistent with a theoretical prediction for the 6H5/2 and 6H7/2 states.

©2014 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.83.014705
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