Subharmonic Gap Structure of Normal-State Conductance and Thermoelectric Effect in a Graphene-Based Nano Device

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Using the quantum transport of chiral Dirac fermions in graphene, we investigate the normal-state conductance and thermoelectric effect of a nano device under the ballistic superconductorgraphene-superconductor (SGS) model. Because of the Josephson effect and Andreev reflections, there exists an oscillatory behavior of the normal-state conductance flowing through the successive discrete energy levels on a finite-sized graphene contacted to the superconducting leads. The normal-state conductance displays a rich structure of subharmonic gaps controlled by means of a gate voltage on the discrete energy levels near the Fermi energy. Since the Fermi energy is an essential factor in determining the nature of conduction such as n or p type, we study the thermoelectric effect over the graphene-based nano device. It is shown that the thermoelectric effect can provide information on the location of the Fermi energy with respect to the energy levels of the finite-sized graphene.
Publisher
AMER SCIENTIFIC PUBLISHERS
Issue Date
2008-09
Language
English
Article Type
Article; Proceedings Paper
Citation

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.8, pp.4692 - 4697

ISSN
1533-4880
DOI
10.1166/jnn.2008.IC64
URI
http://hdl.handle.net/10203/286113
Appears in Collection
EEW-Journal Papers(저널논문)
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