Electron-Electron Interaction in the Magnetoresistance of Graphene

Johannes Jobst, Daniel Waldmann, Igor V. Gornyi, Alexander D. Mirlin, and Heiko B. Weber
Phys. Rev. Lett. 108, 106601 – Published 7 March 2012
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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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  • Received 26 October 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.106601

© 2012 American Physical Society

Authors & Affiliations

Johannes Jobst1, Daniel Waldmann1, Igor V. Gornyi2,3, Alexander D. Mirlin2,4,5, and Heiko B. Weber1,*

  • 1Lehrstuhl für Angewandte Physik, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
  • 2Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
  • 3A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia
  • 4Institut für Theorie der kondensierten Materie, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
  • 5Petersburg Nuclear Physics Institute, 188300 St. Petersburg, Russia

  • *heiko.weber@physik.uni-erlangen.de; http://www.lap.physik.uni-erlangen.de/

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Issue

Vol. 108, Iss. 10 — 9 March 2012

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