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  • Title: Breakdown of Ohm's Law in Molecular Junctions with Electrodes of Single-Layer Graphene.
    Author: Bâldea I, Chen Y, Zhang M, Xin N, Feng Y, Feng J, Jia C, Guo X, Xie Z.
    Journal: J Phys Chem Lett; 2024 Mar 28; 15(12):3267-3275. PubMed ID: 38489078.
    Abstract:
    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.
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