Boundary Scattering in Ballistic Graphene

Abstract

We report magnetotransport measurements in ballistic graphene/hexagonal boron nitride mesoscopic wires where the charge carrier mean free path is comparable to wire width $W$. Magnetoresistance curves show characteristic peak structures where the peak field scales with the ratio of cyclotron radius $R_{\text{c}}$ and wire width $W$ as $W/R_{\text{c}}=0.9\pm 0.1$, due to diffusive boundary scattering. The obtained proportionality constant between $R_{\text{c}}$ and $W$ differs from that of a classical semiconductor 2D electron system where $W/R_{\text{c}}=0.55$.

14 pages, 4 figures

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• Imaging Cyclotron Orbits of Electrons in Graphene
• Size quantization of Dirac fermions in graphene constrictions
• Edge scattering of electrons in graphene
• Edge-channel interferometer at the graphene quantum Hall pn junction
• Commensurability Oscillations in One-Dimensional Graphene Superlattices
• Theoretical prediction of a giant anisotropic magnetoresistance in carbon nanoscrolls
• Imaging ballistic carrier trajectories in graphene using scanning gate microscopy
• High-quality multi-terminal suspended graphene devices
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• Non-linear Transport Phenomena and Current-induced Hydrodynamics in Ultra-high Mobility Two-dimensional Electron Gas
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