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  1. 1 Acta Physica Polonica A

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  1. 1 2014

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  1. 1 Rut G.

  2. 1 Rycerz A.

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Conditions for Conductance Quantization in Mesoscopic Dirac Systems on the Examples of Graphene Nanoconstrictions

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Rut G., Rycerz A.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 4a
A-114-A-118
EN
Ballistic transport through an impurity-free section of the Corbino disk in graphene is investigated by means of the Landauer-Büttiker formalism in the mesoscopic limit. In the linear-response regime the conductance is quantized in steps close to integer multiples of 4e²/h, yet Fabry-Perot oscillations are strongly suppressed. The quantization arises for small opening angles θ ≲ π/3 and large radii ratios R_2/R_1 ≳ 10. We find that the condition for emergence of the n-th conductance step can be written as √nθ/π ≪ 1. A brief comparison with the conductance spectra of graphene nanoribbons with parallel edges is also provided.
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