Novel electric field effects on magneto-optical conductivity in eight-Pmmn borophene

Abstract

We theoretically study the Landau levels and the magneto-optical conductivity of eight-Pmmn borophene in the presence of a perpendicular magnetic field and an inplane electric field. We find that in the absence of the inplane electric field, the magneto-optical conductivity of eight-Pmmn borophene presents a series of striking single resonance peaks as functions of the frequency ω, and the longitudinal conductivities are found to be anisotropic due to its anisotropic tilted Dirac cones. In the presence of the inplane electric field, some novel effects are predicted on the Landau levels and the magneto-optical conductivity. The Landau level spacings in the two tilted Dirac cones are different, which lifts the degeneracy of the twofold valley, and the magneto-optical conductivity appears a double peak structure. We also discuss the influence of the chemical potential between different Landau levels on the double peak of the magneto-optical response. The valley related magneto-optical properties in the anisotropic structure may make eight-Pmmn borophene a candidate for the new optical devices.

Magneto-Optical Transport Properties of Type-II Nodal Line Semimetals

“…In experiments, these resonance peaks can reflect the basic band structure [ 36 , 37 , 38 ], and the magneto-optical properties as a response function are also a particular experimental measure for topological materials [ 39 , 40 ]. Recent studies on magneto-optical properties have provided very useful information for topological semimetals [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. Therefore, this work based on Kubo formula to study the magneto-optical transport properties of type-II NLS is valuable.…”