Reyes Villagrana, Raúl A.; Carrera Escobedo, Víctor Hugo; Suárez López, Jaime Raúl; Madrigal Melchor, Jesús; Rodríguez Vargas, Isaac
Resumen:
Energy minibands are a basic feature of practically any superlattice. In this regard graphene
superlattices are not the exception and recently miniband transport has been reported
through magneto-transport measurements. In this work, we compute the energy miniband
and transport characteristics for graphene superlattices in which the energy barriers
are generated by magnetic and electric fields. The transfer matrix approach and the Landauer-
Büttiker formalism have been implemented to calculate the energy minibands and
the linear-regime conductance. We find that energy minibands are very sensitive to the
magnetic field and become degenerate by rising it. We were also able to correlate the
evolution of the energy minibands as a function of the magnetic field with the transport
characteristics, finding that miniband transport can be destroyed by magnetic field effects.
Here, it is important to remark that although magnetic field effects have been a key
element to unveil miniband transport, they can also destroy it.