Publication: Nonequilibrium transport through a disordered molecular nanowire
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2017-05-30
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American Physical Society
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Abstract
We investigate the nonequilibrium transport properties of a disordered molecular nanowire. The nanowire is regarded as a quasi-one-dimensional organic crystal composed of self-assembled molecules. One orbital and a single random energy are assigned to each molecule while the intermolecular coupling does not fluctuate. Consequently, electronic states are expected to be spatially localized. We consider the regime of strong localization, namely, the localization length is smaller than the length of the molecular wire. Electron-vibron interaction, taking place at each single molecule, is also considered. We investigate the interplay between static disorder and electron-vibron interaction in response to either an applied electric bias or a temperature gradient. To this end, we calculate the electric and heat currents when the nanowire is connected to leads, using the Keldysh nonequilibrium Green's function formalism. At intermediate temperature, scattering by disorder dominates both charge and heat transport. We find that the electron-vibron interaction enhances the effect of the disorder on the transport properties due to the decrease of the coherent electron tunneling among molecules.
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©2017 American Physical Society.
The authors are grateful to D. Sánchez, M. A. Sierra, and C. Álvarez for helpful discussions. F. D-A. thanks the Theoretical Physics Group of the University of Warwick for the warm hospitality. Work at Madrid has been supported by MINECO under Grants No. MAT2013-46308 and No. MAT2016-75955. UK research data statement: all data accompanying this publication are directly available within the publication.