Heavy surface state in a possible topological Kondo insulator: Magneto-thermoelectric transport on the (011)-plane of SmB${}_6$

Abstract

Motivated by the high sensitivity to Fermi surface topology and scattering mechanisms in magneto-thermoelectric transport, we have measured the thermopower and Nernst effect on the (011)-plane of the proposed topological Kondo insulator SmB${}_6$. These experiments, together with electrical resistivity and Hall effect measurements, demonstrate that the (011)-plane also harbors a metallic surface with the effective mass in the order of 10-10${}^2$ $m_0$. The surface and bulk conductances are well distinguished in these measurements and are categorized into metallic and non-degenerate semiconducting regimes, respectively. Electronic correlations play an important role in enhancing scattering and also contribute to the heavy surface state.

4 figures, 1 table

References in corpus (7)

• Topological Field Theory of Time-Reversal Invariant Insulators
• Correlated Topological Insulators with Mixed Valence
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Exotic Kondo crossover in a wide temperature region in the topological Kondo insulator SmB6 revealed by high-resolution ARPES
• Two-dimensional heavy fermions on the strongly correlated boundaries of Kondo topological insulators
• Resonant Charge Relaxation as a Likely Source of the Enhanced Thermopower in FeSi

Cited by in corpus (7)

• Quantum Oscillations of Electrical Resistivity in an Insulator
• Kondo Breakdown in Topological Kondo Insulators
• Additional energy scale in SmB${}_6$ at low temperature
• The Effects of Spin-Excitons on the Surface States of SmB6: A Photoemission Study
• Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
• Planar tunneling spectroscopy of the topological Kondo insulator SmB${}_6$
• From bad metal to Kondo insulator: temperature evolution of the optical properties of SmB${}_6$