Polaron effects in heavily doped graphene on substrates

Details Polaron effects in heavily doped graphene on substrates Polaron effects in heavily doped graphene on substrates

2011-07-13

arxiv.org/abs/1107.2507v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures

Scientific paper

Polaron spectral functions are computed for heavily doped graphene-on-substrate systems using the diagrammatic Monte Carlo technique. The specific aim is to investigate the effects of interaction on ARPES spectra when the symmetry between graphene sub-lattices is broken by a substrate. Several polaronic features are visible, including band-flattening and changes in particle lifetimes. The difference between energies on each sub-lattice increases with coupling, indicating an augmented transport gap, while the spectral gap decreases slightly. In the absence of a gap, additional flattening is seen around the K point. Results demonstrate the potential difficulties of using ARPES to establish the size of bandgaps in the presence of substrates.

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