Abstract
Kondo insulators exhibit strong electronic interactions and topological protection, making them a good platform for studying connections between these two fields. New experiments show that a type of magnetic oscillation (the de Hass-van Alphen effect) originates in the surface of a Kondo insulator, bolstering evidence for topologically protected surface states.
Highlights
In Kondo insulators, the physics is controlled by the strong many-body interactions [1]
One of the most exciting phenomena observed in SmB6 is the clear quantum oscillations appearing in magnetic torque at a low temperature despite the insulating behavior in resistance
While our group has reported quantum oscillations corresponding to the 2D Fermi surface (FS) and light carriers that are consistent with the expectation on a typical topological surface state in aluminum-flux-grown samples [12], another work based on the floating-zone (FZ)-grown sample claimed the oscillations have 3D characters bulk origin, and an abnormally enhanced quantum oscillation amplitude suggesting a deviation from the Lifshitz-Kosevich (LK) theory below 3He temperature [13]
Summary
In Kondo insulators, the physics is controlled by the strong many-body interactions [1]. With the magnetic field rotated approximately 60° away from the symmetric axis [101], the FFT amplitude is reduced by a factor of 20–100, consistent with the behavior of the 2D topological surface state in Bi1−xSbx [27] (a detailed comparison is provided in Appendix F).
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