Graphene quantum dots formed by a spatial modulation of the Dirac gap

Abstract

An electrostatic quantum dot cannot be formed in monolayer graphene, because of the Klein tunnelling. However, a dot can be formed with the help of a uniform magnetic field. As shown here, a spatial modulation of the Dirac gap leads to confined states with discrete energy levels, thus defining a dot, without applying external electric and magnetic fields. Gap-induced dot states can coexist and couple with states introduced by an electrostatic potential. This property allows the region in which the resulting states are localized to be tuned with the potential.

3 pages, 3 figures

References in corpus (4)

• The electronic properties of graphene
• Substrate-induced band gap opening in epitaxial graphene
• Quasi-bound states of quantum dots in single and bilayer graphene
• Magnetic field induced confinement-deconfinement transition in graphene quantum dots

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• Qualitative analysis of trapped Dirac fermions in graphene
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• Isolated and hybrid bilayer graphene rings
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• Effect of weak disorder on delocalization properties of gapped graphene superlattices
• Charging graphene nanoribbon quantum dots
• Electronic properties of bilayer graphene with magnetic quantum structures studied using the Dirac equation
• Energy spectra of graphene quantum dots induced between Landau levels