Abstract
Silicene is a competitive and promising 2D material, possessing interesting topological, electronic and optical properties. The presence of strong spin orbit interaction in silicene and its analogues, germanene and tinene, leads to the opening of a gapin the energy spectrum and spin-splitting of the bands in each valley. Building upon prior work we discuss a general method to determine the magneto-optic response of silicene when a Gaussian beam is incident on silicene grown on a dielectric substrate in the presence of a static magnetic field. We use a semiclassical treatment to describe the Faraday rotation (FR) and Magneto-optical Kerr effect (MOKE). The response can be modulated both electrically and magnetically. We derive analytic expressions for valley and spin polarized FR and MOKE for arbitrary polarization of incident light in the terahertz regime. We demonstrate that large FR and MOKE can be achieved by tuning the electric field, magnetic fields and chemical potential in these fascinating 2D materials.
Highlights
Monolayer graphene has garnered immense interest from a large global community of researchers
We have studied the electric field modulated valley and spin polarized Faraday, Kerr rotations and ellipticities for three different topological regimes in silicene
We found that the magnitude of the maximum valley and spin polarized Faraday rotation (FR) and Magneto-optical Kerr effect (MOKE) angles for the first two anti-phase pair is 8◦ and 13◦, respectively
Summary
Monolayer graphene has garnered immense interest from a large global community of researchers This is primarily due to its unique electronic and optical properties [1] derived from its exotic electronic structure. Faraday and Kerr rotations are non-reciprocal magneto-optic (MO) effects, in which the polarization of a plane wave is rotated when linearly polarized light is respectively transmitted or reflected from a transparent medium in the presence of static uniform perpendicular magnetic field B. Both of these effects originate from the breaking of time reversal symmetry by an external applied magnetic field. The FR and magneto-optic Kerr effects (MOKE) observed in a single layer graphene sheet exist only at low frequencies (< 3 THz) and that too in the presence of large magnetic fields
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