Inversion and Quantum Oscillations in Kondo insulators

Recent observations of magnetic quantum oscillations [de Haas-van Alphen (dHvA) effect] in Kondo insulators present a fundamental to challenge the conventional view that the dHvA oscillations can occur only in metals. We investigate this problem by studying the basic models of Kondo insulators for their orbital response to uniform magnetic field using a novel representation for electrons [1]. From our study, we discover that the gapped charge quasiparticles undergo inversion upon decreasing the Kondo coupling, and show that the dHvA oscillations in the Kondo insulating state occur as a bulk phenomenon due to this inversion [2,3].

References:

[1] Brijesh Kumar, Phys. Rev. B 77, 205115 (2008)
[2] Panch Ram and Brijesh Kumar, Phys. Rev. B 96, 075115 (2017)
[3] Panch Ram and Brijesh Kumar, Phys. Rev. B 99, 235130 (2019)