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Crossover of magnetoresistance from fourfold to twofold symmetry in SmB6 single crystal, a topological Kondo insulator

Journal Article


Abstract


  • Topological Kondo insulators have been attracting great attention from the condensed-matter physics community due to their fascinating topological and strongly correlated properties. Here, we report angle-dependent c-axis magnetoresistance (MR) oscillations in a Kondo insulator, SmB6 single crystal, in a magnetic field of up to 13 T rotated in the ab-plane. Four-fold symmetric MR oscillations are first observed above 8K, which result from the fourfold (C4) degeneracy of the bulk Fermi surface of SmB6. With decreasing temperature down to 2.3 K, the C4 symmetry of the MR oscillations gradually weakens and C2 symmetry appears. This demonstrates a crossover from three-dimensional bulk states to two-dimensional surface states and implies the possible emergence of topological nematic states. Our experimental observations shed new light on the metallic surface states and nematic states in the Kondo insulator SmB6.

Publication Date


  • 2015

Citation


  • Yue, Z., Wang, X., Wang, D., Wang, J., Culcer, D. & Dou, S. (2015). Crossover of magnetoresistance from fourfold to twofold symmetry in SmB6 single crystal, a topological Kondo insulator. Journal of the Physical Society of Japan, 84 (4), 044717-1-044717-5.

Scopus Eid


  • 2-s2.0-84926483093

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1372

Has Global Citation Frequency


Start Page


  • 044717-1

End Page


  • 044717-5

Volume


  • 84

Issue


  • 4

Place Of Publication


  • Japan

Abstract


  • Topological Kondo insulators have been attracting great attention from the condensed-matter physics community due to their fascinating topological and strongly correlated properties. Here, we report angle-dependent c-axis magnetoresistance (MR) oscillations in a Kondo insulator, SmB6 single crystal, in a magnetic field of up to 13 T rotated in the ab-plane. Four-fold symmetric MR oscillations are first observed above 8K, which result from the fourfold (C4) degeneracy of the bulk Fermi surface of SmB6. With decreasing temperature down to 2.3 K, the C4 symmetry of the MR oscillations gradually weakens and C2 symmetry appears. This demonstrates a crossover from three-dimensional bulk states to two-dimensional surface states and implies the possible emergence of topological nematic states. Our experimental observations shed new light on the metallic surface states and nematic states in the Kondo insulator SmB6.

Publication Date


  • 2015

Citation


  • Yue, Z., Wang, X., Wang, D., Wang, J., Culcer, D. & Dou, S. (2015). Crossover of magnetoresistance from fourfold to twofold symmetry in SmB6 single crystal, a topological Kondo insulator. Journal of the Physical Society of Japan, 84 (4), 044717-1-044717-5.

Scopus Eid


  • 2-s2.0-84926483093

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1372

Has Global Citation Frequency


Start Page


  • 044717-1

End Page


  • 044717-5

Volume


  • 84

Issue


  • 4

Place Of Publication


  • Japan