Tunable quantum dots in bilayer graphene

Details Tunable quantum dots in bilayer graphene Tunable quantum dots in bilayer graphene

2007-03-07

arxiv.org/abs/cond-mat/0703194v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, to appear in Nano Letters

Scientific paper

We demonstrate theoretically that quantum dots in bilayers of graphene can be realized. A position-dependent doping breaks the equivalence between the upper and lower layer and lifts the degeneracy of the positive and negative momentum states of the dot. Numerical results show the simultaneous presence of electron and hole confined states for certain doping profiles and a remarkable angular momentum dependence of the quantum dot spectrum which is in sharp contrast with that for conventional semiconductor quantum dots. We predict that the optical spectrum will consist of a series of non-equidistant peaks.

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