Kondo Breakdown and Quantum Oscillations in SmB${}_6$

Abstract

Recent quantum oscillation experiments on SmB${}_6$ pose a paradox, for while the angular dependence of the oscillation frequencies suggest a 3D bulk Fermi surface, SmB${}_6$ remains robustly insulating to very high magnetic fields. Moreover, a sudden low temperature upturn in the amplitude of the oscillations raises the possibility of quantum criticality. Here we discuss recently proposed mechanisms for this effect, contrasting bulk and surface scenarios. We argue that topological surface states permit us to reconcile the various data with bulk transport and spectroscopy measurements, interpreting the low temperature upturn in the quantum oscillation amplitudes as a result of surface Kondo breakdown and the high frequency oscillations as large topologically protected orbits around the X point. We discuss various predictions that can be used to test this theory.

References in corpus (9)

• Correlated Topological Insulators with Mixed Valence
• Unconventional Fermi surface in an insulating state
• Direct observation of the spin texture in strongly correlated SmB6 as evidence of the topological Kondo insulator
• Quantum oscillations without a Fermi surface and the anomalous de Haas-van Alphen effect
• Kondo Breakdown in Topological Kondo Insulators
• Quantum oscillation in narrow-gap topological insulators
• Heavy surface state in a possible topological Kondo insulator: Magneto-thermoelectric transport on the (011)-plane of SmB${}_6$
• Surface-state spin textures and mirror Chern numbers in topological Kondo insulators
• Majorana Fermi Sea in Insulating SmB6: A proposal and a Theory of Quantum Oscillations in Kondo Insulators

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