Effects of zigzag edge states on the thermoelectric properties of finite graphene nanoribbons

Thermoelectric properties of finite graphene nanoribbons (GNRs) coupled to metallic electrodes are theoretically studied in the framework of tight-binding model and Green's function approach. When the zigzag sides are coupled to the electrodes, the electron transport through the localized edge...

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Bibliographic Details
Published inarXiv.org
Main Author Kuo, David Ming Ting
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 09.07.2022
Subjects
Electrodes
Electron transport
Graphene
Green's functions
Nanoribbons
Physics - Mesoscale and Nanoscale Physics
Power factor
Quantum dots
Thermoelectricity
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Summary:Thermoelectric properties of finite graphene nanoribbons (GNRs) coupled to metallic electrodes are theoretically studied in the framework of tight-binding model and Green's function approach. When the zigzag sides are coupled to the electrodes, the electron transport through the localized edge states can occur only if the channel length between electrodes is smaller than the decay length of these localized zigzag edge states. When the armchair edges are coupled to the electrodes, there is an interesting thermoelectric behavior associated with the mid-gap states when the GNR is in the semiconducting phase. Here we show that the thermoelectric behavior of zigzag edge states of GNRs with armchair sides connected to electrodes is similar to that of two parallel quantum dots with similar orbital degeneracy. Furthermore, it is demonstrated that the electrical conductance and power factor given by the zigzag edge states are quite robust against the defect scattering.
ISSN:2331-8422
DOI:10.48550/arxiv.2204.04426