Tunable quantum dots in bilayer graphene

TL;DR

This paper theoretically demonstrates the realization of tunable quantum dots in bilayer graphene, highlighting unique electronic and optical properties due to doping-induced asymmetry and angular momentum effects.

Contribution

It introduces a novel theoretical framework for creating and analyzing quantum dots in bilayer graphene with unique spectral features.

Findings

Presence of electron and hole confined states for specific doping profiles

Angular momentum significantly influences the quantum dot spectrum

Optical spectrum exhibits non-equidistant peaks

Abstract

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.