Bilayer graphene with single and multiple electrostatic barriers: Band structure and transmission

作者：Barbier Michael^*; Vasilopoulos P; Peeters F M; Pereira J Milton Jr

来源：Physical Review B, 2009, 79(15): 155402.

DOI：10.1103/PhysRevB.79.155402

• band structure
• carrier mobility
• dispersion relations
• electrical conductivity
• electronic density of states
• graphene
• superlattices

We evaluate the electronic transmission and conductance in bilayer graphene through a finite number of potential barriers. Further, we evaluate the dispersion relation in a bilayer graphene superlattice with a periodic potential applied to both layers. As a model we use the tight-binding Hamiltonian in the continuum approximation. For zero bias the dispersion relation shows a finite gap for carriers with zero momentum in the direction parallel to the barriers. This is in contrast to single-layer graphene where no such gap was found. A gap also appears for a finite bias. Numerical results for the energy spectrum, conductance, and the density of states are presented and contrasted with those pertaining to single-layer graphene.

• 出版日期2009-4