Size quantization of Dirac fermions in graphene constrictions

B. Terrés; L. A. Chizhova; F. Libisch; J. Peiro; D. Jörger; S. Engels; A. Girschik; K. Watanabe; T. Taniguchi; S. V. Rotkin; J. Burgdörfer; C. Stampfer

doi:10.1038/ncomms11528

論文 Size quantization of Dirac fermions in graphene constrictions

B. Terrés ; L. A. Chizhova ; F. Libisch ; J. Peiro ; D. Jörger ; S. Engels ; A. Girschik ; K. Watanabe (National Institute for Materials Science) ; T. Taniguchi (National Institute for Materials Science) ; S. V. Rotkin ; J. Burgdörfer ; C. Stampfer

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B. Terrés, L. A. Chizhova, F. Libisch, J. Peiro, D. Jörger, S. Engels, A. Girschik, K. Watanabe, T. Taniguchi, S. V. Rotkin, J. Burgdörfer, C. Stampfer. Size quantization of Dirac fermions in graphene constrictions. Nature Communications. 2016, 7 (), 11528. https://doi.org/10.1038/ncomms11528

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(abstract)

We show ballistic transport and quantized conductance of size-confined Dirac fermions in lithographically-defined graphene quantum point contacts. At high charge carrier densities, the observed conductance agrees excellently with the Landauer theory of ballistic transport, without any adjustable parameter. Experimental data and simulations for the evolution of the conductance with magnetic field unambiguously confirm the identification of size quantization in the constriction.

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