Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-03-02
Phys. Rev. B 79, 195327 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 4 figures. Typos and equations (2-4) have been corrected. Phys. Rev. B 79, 195327 (2009)
Scientific paper
10.1103/PhysRevB.79.195327
Four-terminal resistances, both longitudinal and diagonal, of a locally gated graphene device are measured in the quantum-Hall (QH) regime. In sharp distinction from previous two-terminal studies [J. R. Williams \textit{et al.}, Science {\bf 317}, 638 (2007); B. \"{O}zyilmaz \textit{et al.}, Phys. Rev. Lett. {\bf 99}, 166804 (2007)], asymmetric QH resistances are observed, which provide information on reflection as well as transmission of the QH edge states. Most quantized values of resistances are well analyzed by the assumption that all edge states are equally populated. Contrary to the expectation, however, a 5/2 transmission of the edge states is also found, which may be caused by incomplete mode mixing and/or by the presence of counter-propagating edge states. This four-terminal scheme can be conveniently used to study the edge-state equilibration in locally gated graphene devices as well as mono- and multi-layer graphene hybrid structures.
Ki Dong-Keun
Lee Hu-Jong
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