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    Incomplete protection of the surface Weyl cones of the Kondo insulator SmB6: Spin exciton scattering

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    Genre
    Journal Article
    Date
    2015-08-20
    Author
    Kapilevich, GA
    Riseborough, PS
    Gray, AX
    Gulacsi, M
    Durakiewicz, T
    Smith, JL
    Subject
    cond-mat.str-el
    cond-mat.str-el
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5777
    
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    DOI
    10.1103/PhysRevB.92.085133
    Abstract
    © 2015 American Physical Society. The compound SmB6 is a Kondo insulator, where the lowest-energy bulk electronic excitations are spin-excitons. It also has surface states that are subjected to strong spin-orbit coupling. It has been suggested that SmB6 is also a topological insulator. Here we show that, despite the absence of time-reversal symmetry breaking and the presence of strong spin-orbit coupling, the chiral spin texture of the Weyl cone is not completely protected. In particular, we show that the spin-exciton-mediated scattering produces features in the surface electronic spectrum at energies separated from the surface Fermi energy by the spin-exciton energy. Despite the features being far removed from the surface Fermi energy, they are extremely temperature dependent. The temperature variation occurs over a characteristic scale determined by the dispersion of the spin-exciton. The structures may be observed by electron spectroscopy at low temperatures.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review B - Condensed Matter and Materials Physics
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5759
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