Tunable graphene bandgaps from superstrate mediated interactions

Details Tunable graphene bandgaps from superstrate mediated interactions Tunable graphene bandgaps from superstrate mediated interactions

2011-03-21

arxiv.org/abs/1103.3943v2

Physical Review B, 84(15), p. 155438. (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.84.155438

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

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