Transport through graphene on SrTiO3

Details Transport through graphene on SrTiO3 Transport through graphene on SrTiO3

2011-07-16

arxiv.org/abs/1107.3241v1

Phys. Rev. Lett. 107, 225501 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.225501

We report transport measurements through graphene on SrTiO3 substrates as a function of magnetic field B, carrier density n, and temperature T. The large dielectric constant of SrTiO3 screens very effectively long-range electron-electron interactions and potential fluctuations, making Dirac electrons in graphene virtually non-interacting. The absence of interactions results in a unexpected behavior of the longitudinal resistance in the N=0 Landau level, and in a large suppression of the transport gap in nano-ribbons. The "bulk" transport properties of graphene at B=0T, on the contrary, are completely unaffected by the substrate dielectric constant.

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