Tunable graphene band gaps from superstrate-mediated interactions

Hague, J. P. (2011). Tunable graphene band gaps from superstrate-mediated interactions. Physical Review B, 84(15) p. 155438.

DOI: https://doi.org/10.1103/PhysRevB.84.155438


A theory is presented for the strong enhancement of graphene-on-substrate band gaps by attractive interactions mediated through phonons in a polarizable superstrate. It is demonstrated that gaps of up to 1 eV can be formed for experimentally achievable values of electron-phonon coupling and phonon frequency. Gap enhancements range between factors of 1 to 4, indicating possible benefits to graphene electronics through greater band-gap control for digital applications, lasers, light-emitting diodes, and photovoltaics through the relatively simple application of polarizable materials such as SiO2 and Si3N4.

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