Quantum linear magnetoresistance (QLMR) and Shubnikov de-Haas oscillations are investigated in suspended multilayer graphene devices developed using a technique involving exfoliation and transfer of graphene using nanomanipulators. Wrinkled multilayer graphene showed QLMR at 300 mK,
whereas in smooth few layer graphene Shubnikov-de-Haas oscillation were observed at magnetic fields above 4 T at temperatures below 30 K. The carrier density (ns) in the wrinkled graphene is in the range 5.2 × 109 cm-2 (at B ~ 0) to 3.5 × 1013
cm-2 (at B = 12 T). The corresponding effective masses are 0.001me
~ 0 and 0.121me
, respectively. At B ~ 12 T the concentration of scatterers (Ni
) is ~1.02 × 1014 cm-2 which is ~3ns
From the analysis of the SdH oscillations we show smooth multilayer graphene devices have a carrier density 1.39—2.85 × 1012 cm-2 and effective mass (0.022me
≤ m* ≤ 0.032me
) comparable to values reported on
exfoliated single layer graphene devices. The wrinkling induces strong disorder leading to massive Dirac Fermions at high magnetic field with a broken-symmetry Dirac point. High frequecny coplanar waveguide devices were fabricated using the same technique, the Graphene devices were found to
be conductive with a high transmission up to 50 GHz.
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Quantum Linear Magnetoresistance;
Shubnikov Dehaas Oscillations
Document Type: Research Article
Nano-Scale Transport Physics Laboratory, School of Physics, and DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Johannesburg, 2050, South Africa
Orbilectron Consulting (Pty) Ltd., Port Elizabeth, 6045, South Africa
Publication date: August 1, 2017
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Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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