Electron-electron interaction in the magnetoresistance of graphene |
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Authors: | Jobst Johannes Waldmann Daniel Gornyi Igor V Mirlin Alexander D Weber Heiko B |
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Institution: | Lehrstuhl für Angewandte Physik, Universit?t Erlangen-Nürnberg, 91058 Erlangen, Germany. |
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Abstract: | We investigate the magnetotransport in large area graphene Hall bars epitaxially grown on silicon carbide. In the intermediate field regime between weak localization and Landau quantization, the observed temperature-dependent parabolic magnetoresistivity is a manifestation of the electron-electron interaction. We can consistently describe the data with a model for diffusive (magneto)transport that also includes magnetic-field-dependent effects originating from ballistic time scales. We find an excellent agreement between the experimentally observed temperature dependence of magnetoresistivity and the theory of electron-electron interaction in the diffusive regime. We can further assign a temperature-driven crossover to the reduction of the multiplet modes contributing to electron-electron interaction from 7 to 3 due to intervalley scattering. In addition, we find a temperature-independent ballistic contribution to the magnetoresistivity in classically strong magnetic fields. |
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