Tunable Band Gap in Graphene with a Non-Centrosymmetric Superlattice Potential - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: We show that, if graphene is subjected to the potential from an externalsuperlattice, a band gap develops at the Dirac point provided the superlatticepotential has broken inversion symmetry. As a numerical example, we calculatethe band structure of graphene in the presence of an external potential due toperiodically patterned gates arranged in a triangular graphene superlatticeTGS with broken inversion symmetry, and find that a band gap is created atboth the original and -second generation- Dirac point. The gap can becontrolled, in principle, by changing the external potential and the latticeconstant of the TGS.



Autor: Rakesh P Tiwari, D. Stroud

Fuente: https://arxiv.org/



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