1303.6941 (J. P. Hague)
J. P. Hague
There are a large number of atomically thin films with similar structure to graphene. These films have a spread of bandgaps relating to their ionicity, and also to the substrate on which they are grown. Such films could have a range of applications in digital electronics where graphene is difficult to use. I use the dynamical cluster approximation to show how electron-phonon coupling between film and substrate can enhance these gaps in a way that depends on the range and strength of the coupling, as well as the length scales of spatial fluctuations. One of the driving factors in this effect is the proximity to a charge density wave instability, which could in principle generate gaps in graphene. The enhancement at intermediate coupling is sufficiently large that spatially varying substrates and superstrates could be used to create heterostructures in thin graphitic films with position dependent electron-phonon coupling and gaps, leading to advanced electronic components.
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http://arxiv.org/abs/1303.6941
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