Controlling the energy gap of graphene by Fermi velocity engineering
arXiv:1412.0516 · doi:10.1016/j.physleta.2014.11.005
Abstract
The electronic structure of a single-layer graphene with a periodic Fermi velocity modulation is investigated by using an effective Dirac-like Hamiltonian. In a gapless graphene or in a graphene with a constant energy gap the modulation of the Fermi velocity, as expected, only changes the dispersion between energy and moment, turning the minibands narrower or less narrow than in the usual graphene depending on how the Fermi velocity is modulated and the energy gap remains the same. However, with a modulated energy gap it is possible to control the energy gap of graphene by Fermi velocity engineering. This is based on a very simple idea that has never been reported so far. The results obtained here reveal a new way of controlling the energy gap of graphene, which can be used in the fabrication of graphene-based devices.
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Cited by in corpus (8)
- Pseudo-magnetic field in curved graphene
- Localization of massless Dirac particles via spatial modulations of the Fermi velocity
- Tuning the Fano factor of graphene via Fermi velocity modulation
- Electronic structure of a graphene superlattice with a modulated Fermi velocity
- Perfect valley filter controlled by Fermi velocity modulation in graphene
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- Mass-profile quantum dots in graphene