Cyclotron Resonance in Graphene at Ultrahigh Magnetic Fields

ORAL

Abstract

To investigate the effects of intentional and unintentional doping on the conduction properties of CVD-grown large-area graphene, we have performed high-field cyclotron resonance (CR) measurements on graphene. We accessed ultrahigh magnetic fields using the Single-Turn Coil System at NHMFL-Los Alamos, which can produce peak fields over 300 T in $\sim $2.5 $\mu $s pulses. We investigated magneto-infrared transmission at 10.6 $\mu $m in pulsed ultrahigh magnetic fields up to 170 T for a variety of graphene samples on KRS-5 substrates with different levels of doping. Circularly polarized CO$_{2}$ light was used to determine the carrier type of the doping, and temperature-dependent measurements were also performed. We observed a clear CR peak at $\sim $50 T corresponding to the $n$ = 1 to $n$ = 2 Landau level transition, which indicates that the Fermi energy measured from the Dirac point has to be $\sim $250-400 meV.

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Authors

  • L.G. Booshehri

    Department of Electrical and Computer Engineering, Rice University, Rice Univ., LANL

  • C.H. Mielke

    NHMFL-PFF (LANL), LANL

  • Scott Crooker

    LANL, National High Magnetic Field Laboratory, Los Alamos National Lab

  • L. Ren

    Department of Electrical and Computer Engineering, Rice University, Rice Univ.

  • E.H. Haroz

    Department of Electrical \& Computer Engineering, Rice University, Rice Univ.

  • Z. Jin

    Department of Chemistry, Rice University, Rice Univ.

  • Z. Sun

    Rice Univ.

  • Z. Yan

    Department of Chemistry, Rice University, Rice Univ.

  • J.M. Tour

    Department of Chemistry, Rice University, Rice University, Rice Univ.

  • J. Kono

    Department of Electrical \& Computer Engineering, Rice University, Rice University, Department of Electrical and Computer Engineering, Rice University, Department of Electrical Engineering, Rice University, Houston, Texas 77005, ECE Dept., Rice University, Dept. of Electrical and Computer Engineering, Rice University, Rice Univ.