Magneto-optical properties in thin film topological insulators with quadratic momentum term

Abstract

In this work we investigate the influence of quadratic in momentum term (Schrodinger term) on magneto-transport properties of thin film topological insulators. The Schrodinger term modifies the Dirac cones into an hourglass shape which results in inter and intraband Landau levels crossings. Breaking of the particle–hole symmetry in Landau level spectrum in the presence of k 2 term leads to asymmetrical density of states profile. We calculate collisional and Hall conductivity for mixed Dirac–Schrodinger system in linear response regime and show oscillatory behavior in collisional conductivity, while Zeeman and hybridization terms provide a doubly split peak structure in collisional conductivity for the case m/m e → ∞. We calculate Hall conductivity analytically and show that for mixed system filling factor is not symmetric about Fermi energy unlike symmetric plateaus for pure Dirac case.