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Breakdown of Ohm’s law in molecular junctions with electrodes of single-layer graphene

For sufficiently low biases, Ohm’s law, the cornerstone of electricity, stating that current I and voltage V are proportional, is satisfied at low biases for all known systems ranging from macroscopic conductors to nanojunctions. In this study, we predict theoretically and demonstrate experimentally...

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Bibliographic Details
Main Authors: Bâldea, Ioan (Author) , Chen, Yuhong (Author) , Zhang, Miao (Author) , Xin, Na (Author) , Feng, Yunxia (Author) , Feng, Jiajun (Author) , Jia, Chuancheng (Author) , Guo, Xuefeng (Author) , Xie, Zuoti (Author)
Format: Article (Journal)
Language:English
Published: 28 March 2024
In: The journal of physical chemistry letters
Year: 2024, Volume: 15, Issue: 12, Pages: 3267-3275
ISSN:1948-7185
DOI:10.1021/acs.jpclett.4c00387
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.jpclett.4c00387
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Author Notes:Ioan Bâldea, Yuhong Chen, Miao Zhang, Na Xin, Yunxia Feng, Jiajun Feng, Chuancheng Jia, Xuefeng Guo, and Zuoti Xie
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Summary:For sufficiently low biases, Ohm’s law, the cornerstone of electricity, stating that current I and voltage V are proportional, is satisfied at low biases for all known systems ranging from macroscopic conductors to nanojunctions. In this study, we predict theoretically and demonstrate experimentally that in single-molecule junctions fabricated with single-layer graphene as electrodes the current at low V scales as the cube of V, thereby invalidating Ohm’s law. The absence of the ohmic regime is a direct consequence of the unique band structure of the single-layer graphene, whose vanishing density of states at the Dirac points precludes electron transfer from and to the electrodes at low biases.
Item Description:Online veröffentlicht: 15. März 2024
Gesehen am 16.08.2024
Physical Description:Online Resource
ISSN:1948-7185
DOI:10.1021/acs.jpclett.4c00387

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