Weak Antilocalization and Linear Magnetoresistance in The Surface State of SmB6

Understand

Strongly correlated Kondo insulator SmB6 is known for its peculiar low temperature residual conduction, which has recently been demonstrated to arise from a robust metallic surface state, as predicted by the theory of topological Kondo insulator (TKI).

• Photoemission, quantum oscillation and magnetic doping experiments have provided evidence for the Dirac-like dispersion and topological protection.
• Questions arise as whether signatures of spin-momentum locking and electron interaction could be resolved in transport measurements.
• Here we report metallic conduction of surface state down to mK temperatures with saturation behaviors suggestive of Kondo effect.