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Søren Ulstrup

Detecting the local transport properties and the dimensionality of transport of epitaxial graphene by a multi-point probe approach

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  • Lucas Barreto, Denmark
  • Edward Perkins, Denmark
  • Jens Johannsen
  • Søren Ulstrup
  • Felix Fromm, Universität Erlangen-Nürnberg, Germany
  • Christian Raidel, Universität Erlangen-Nürnberg, Germany
  • Thomas Seyller, Technische Universität Chemnitz, Germany
  • Philip Hofmann

The electronic transport properties of epitaxial monolayer graphene (MLG) and hydrogen-intercalated quasi free-standing bilayer graphene (QFBLG) on SiC(0001) are investigated by micro multi-point probes. Using a probe with 12 contacts, we perform four-point probe measurements with the possibility to effectively vary the contact spacing over more than one order of magnitude, allowing us to establish that the transport is purely two-dimensional. Combined with the carrier density obtained by angle-resolved photoemission spectroscopy, we find the room temperature mobility of MLG to be (870+-120)cm2/Vs. The transport in QFBLG is also found to be two-dimensional with a mobility of (1600+-160) cm2/Vs.

Original languageEnglish
JournalApplied Physics Letters
Number of pages3
Publication statusPublished - 25 Jan 2013

    Research areas

  • cond-mat.mes-hall, cond-mat.str-el

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