Dot-bound and dispersive states in graphene quantum dot superlattices

作者：Pieper A^*; Heinisch R L; Wellein G; Fehske H

来源：Physical Review B, 2014, 89(16): 165121.

DOI：10.1103/PhysRevB.89.165121

We consider a square lattice configuration of circular gate-defined quantum dots in an unbiased graphene sheet and calculate the electronic, particularly spectral properties of finite albeit actual sample sized systems by means of a numerically exact kernel polynomial expansion technique. Analyzing the local density of states and the momentum resolved photoemission spectrum we find clear evidence for a series of quasibound states at the dots, which can be probed by optical measurements. We further analyze the interplay of the superlattice structure with dot-localized modes on the electron energy dispersion. Effects of disordered dot lattices are discussed too.

• 出版日期2014-4-18