Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 81: Graphene: Transport
HL 81.5: Vortrag
Donnerstag, 17. März 2011, 15:30–15:45, POT 151
Magnetotransport property of multigraphene in pulsed magnetic fields up to 62 T — José Luis Barzola Quiquia1, Humberto Peredo1, Srujana Dusari1, •Prasanta Kumar Muduli1, Carsten Putzke2, and Thomas Herrmannsdörfer2 — 1Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig, Germany — 2Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany
Many properties of the graphene like Dirac fermions, quantum Hall effect and fractional quantum Hall effect can be also observed in few-layers graphene or multigraphene samples. Therefore, magnetotransport study in multigraphene is an interesting area of research. In particular, the high-field properties of multigraphene are rather unknown. Most of the previous studies at high magnetic field were done on bulk graphite. However, those measurements do not reflect the intrinsic properties of graphite due to the influence of lattice defects and impurities. In order to investigate many aspects of high-field phenomena, we have made a detailed study of magnetic field-dependent longitudinal and Hall resistance in micrometer-sized and 30 nm thick multigraphene samples in pulsed magnetic field up to 62 T. We found that most of the features observed in the longitudinal and Hall resistance can be explained in a simple two-band model with nearly compensation of electrons and holes. The magnetoresistance and Hall resistance was found to saturate at high fields as expected within the two-band model. At low temperature, however, the magnetoresistance does not saturate above 20 T.