6 research outputs found
Scattering theory and ground-state energy of Dirac fermions in graphene with two Coulomb impurities
We study the physics of Dirac fermions in a gapped graphene monolayer containing two Coulomb impurities. For the case of equal impurity charges, we discuss the ground-state energy using the linear combination of atomic orbitals (LCAO) approach. For opposite charges of the Coulomb centers, an electric dipole potential results at large distances. We provide a nonperturbative analysis of the corresponding low-energy scattering problem
Particle transport in graphene nanoribbon driven by ultrashort pulses
We study charge transport in a graphene zigzag nanoribbon driven by an external
time-periodic kicking potential. Using the exact solution of the time-dependent Dirac
equation with a delta-kick potential acting in each period, we study the time evolution of
the population transfer probability and the time-dependent optical conductivity. By
variation of the kicking parameters, the conductivity becomes widely tunable
Particle transport in graphene nanoribbon driven by ultrashort pulses
We study charge transport in a graphene zigzag nanoribbon driven by an external
time-periodic kicking potential. Using the exact solution of the time-dependent Dirac
equation with a delta-kick potential acting in each period, we study the time evolution of
the population transfer probability and the time-dependent optical conductivity. By
variation of the kicking parameters, the conductivity becomes widely tunable