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Twisting the height away

Multilayer graphene grown at Georgia Tech to heights of 1 to 10 nanometers contains non-graphitic “twists” between layers. Our recent theory describes the top layer as a single, effectively isolated graphene sheet. The remaining multilayer creates a periodically varying mass of the top-layer electrons: from positive, to zero, to negative(!). This makes intuition from single-layer graphene available for the analysis of twisted multilayer graphene, and predicts a regular pattern in the electronic structure that has been observed in experiments from our GT/NIST collaboration.

multilayer graphene grown at Georgia Tech

Real space energy-gap map as observed through

scanning tunneling spectroscopy and explained by

our theory.