Enhanced quantum oscillations in Kondo Insulators*

We investigate quantum oscillations resulting from the Kondo screening due to Landau levels in Kondo insulators. It is shown that
even for large Kondo insulating gap, appreciable amplitudes of oscillations for Kondo insulators in moderate magnetic fields are present in magnetization even at zero temperature. Specifically, based on the Anderson Lattice Hamiltonian, we analyze the magnetization of Kondo insulators by resorting to the slave-boson method. By including Landau levels, mean-field solutions are determined self-consistently. We find that mean-field parameters oscillate in response to the change of the magnetic field. As an outcome, instead of being rigid electronic structure, the energy band of Kondo insulators is non-rigid and oscillate with respect to the change of the magnetic field. Our results indicate that the nonrigidity of the electronic structure in Kondo insulators results in enhanced and observable quantum oscillations in magnetization.