Quantized electron transport through graphene nanoconstrictions

We study the quantization of Dirac fermions in lithographically defined graphene nanoconstrictions. We observe quantized conductance in single nanoconstrictions fabricated on top of a thin hexamethyldisilazane layer over a Si/SiO_2 wafer. This nanofabrication method allows us to obtain well defined...

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Bibliographic Details
Published in:arXiv.org 2018-02
Main Authors: Clerico, V, Delgado-Notario, J A, Saiz-Bretin, M, Fuentevilla, C H, Malyshev, A V, Lejarreta, J D, Diez, E, Dominguez-Adame, F
Format: Article
Language:English
Subjects:
Computer simulation
Electron transport
Fermions
Graphene
Measurement
Nanofabrication
Quantum interference effects
Resistance
Roughness
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Summary:We study the quantization of Dirac fermions in lithographically defined graphene nanoconstrictions. We observe quantized conductance in single nanoconstrictions fabricated on top of a thin hexamethyldisilazane layer over a Si/SiO_2 wafer. This nanofabrication method allows us to obtain well defined edges in the nanoconstrictions, thus reducing the effects of edge roughness on the conductance. We prove the occurrence of ballistic transport and identify several size quantization plateaus in the conductance at low temperature. Experimental data and numerical simulations show good agreement, demonstrating that the smoothing of the plateaus is not related to edge roughness but to quantum interference effects.
ISSN:2331-8422
DOI:10.48550/arxiv.1802.09762