Cyclotron resonance in Kondo insulator

Abstract

Motivated by the recent experimental observations of quantum oscillations in the Kondo insulators SmB${}_6$ and YbB${}_{12}$, we study magneto-optical conductivity of Kondo insulators. We show that there exist non-trivial cyclotron resonance peaks in a frequency domain below the hybridization gap as a result of the characteristic Landau level structure of the system. Furthermore, these low energy peaks are enhanced near the insulator-metal phase transition driven by an applied magnetic field and stable even at low temperatures. They are smoothly connected via Kondo effect to resonance peaks for unhybridized conduction and $f$-electrons at high temperature. The non-trivial cyclotron resonance is a dynamical counterpart of quantum oscillations in static quantities, and through this intimate connection it will provide a useful insight for the latter.

7 pages

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Cited by in corpus (8)

• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Two relativistic Kondo effects: Classification with particle and antiparticle impurities
• Charge neutral fermions and magnetic field driven instability in insulating YbIr${}_3$Si${}_7$
• Low-temperature theory of inversion and quantum oscillations in Kondo insulators
• Quantum oscillations in the heat capacity of Kondo insulator YbB12
• Enhancement of charge-neutral fermionic excitation near spin-flop transition\\ in magnetic Kondo material YbIr${}_3$Si${}_7$
• Robust orbital diamagnetism of correlated Dirac fermions in chiral Ising universality class
• Theoretical investigation of quantum oscillations of specific heat in Kondo insulators