3 research outputs found
Magneto-tunable terahertz absorption in single-layer graphene: A general approach
Terahertz (THz) anisotropic absorption in graphene could be significantly
modified upon applying a static magnetic field on its ultra-fast 2D Dirac
electrons. In general, by deriving the generalized Fresnel coefficients for
monolayer graphene under applied magnetic field, relatively high anisotropic
absorption for the incoming linearly polarized light with specific scattering
angles could be achieved. We also prove that the light absorption of monolayer
graphene corresponds well to its surface optical conductivity in the presence
of a static magnetic field. Moreover, the temperature-dependent conductivity of
graphene makes it possible to show that a step by step absorption feature would
emerge at very low temperatures. We believe that these properties may be
considered to be used in novel graphene-based THz application
Bound states for massive Dirac fermions in graphene in a magnetic step field
We calculate the spectrum of massive Dirac fermions in graphene in the
presence of an inhomogeneous magnetic field modeled by a step function. We find
an analytical universal relation between the bandwidths and the propagating
velocities of the modes at the border of the magnetic region, showing how by
tuning the mass term one can control the speed of these traveling edge states.Comment: 7 pages, 3 figure