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      Direct observation of surface-state thermal oscillations in \({\mathrm{SmB}}_{6}\) oscillators

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          Topological Kondo Insulators

          Kondo insulators are particularly simple type of heavy electron material, where a filled band of heavy quasiparticles gives rise to a narrow band insulator. Starting with the Anderson lattice Hamiltonian, we develop a topological classification of emergent band structures for Kondo insulators and show that these materials may host three-dimensional topological insulating phases. We propose a general and practical prescription of calculating the Z_2 strong and weak topological insulator indices for various lattice structures. Experimental implications of the topological Kondo insulating behavior are discussed.
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            Magnetic and Semiconducting Properties of SmB6

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              Surface Hall Effect and Nonlocal Transport in SmB6: Evidence for Surface Conduction

               D J Kim,  S. Thomas,  T Grant (2013)
              A topological insulator (TI) is an unusual quantum state in which the insulating bulk is topologically distinct from vacuum, resulting in a unique metallic surface that is robust against time-reversal invariant perturbations. The surface transport, however, remains difficult to isolate from the bulk conduction in most existing TI crystals (particularly Bi2Se3, Bi2Te3 and Sb2Te3) due to impurity caused bulk conduction. We report in large crystals of topological Kondo insulator (TKI) candidate material SmB6 the thickness-independent surface Hall effects and non-local transport, which persist after various surface perturbations. These results serve as proof that at low temperatures SmB6 has a metallic surface that surrounds an insulating bulk, paving the way for transport studies of the surface state in this proposed TKI material.
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                Author and article information

                Journal
                PRBMDO
                Physical Review B
                Phys. Rev. B
                American Physical Society (APS)
                2469-9950
                2469-9969
                January 2018
                January 10 2018
                : 97
                : 3
                10.1103/PhysRevB.97.035121
                © 2018

                https://link.aps.org/licenses/aps-default-license

                https://link.aps.org/licenses/aps-default-accepted-manuscript-license

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