Avoiding self-repulsion in density functional description of biased molecular junctions

Roi Baer; Ester Livshits; Daniel Neuhauser

doi:10.1016/j.chemphys.2006.06.041

Avoiding self-repulsion in density functional description of biased molecular junctions

Roi Baer^*, Ester Livshits, Daniel Neuhauser

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

We examine the effects of self-repulsion on the predictions of charge distribution in biased molecular junctions by the local density functional theory methods. This is done using a functional with explicit long-range exchange term effects [R. Baer, D. Neuhauser, Phys. Rev. Lett. 94 (2005) 043002]. We discuss in detail the new density functional, pointing out some of the remaining difficulties in the theory. We find that in weakly coupled junctions (the typical molecular electronics case) local-density functionals fail to describe correctly the charge distribution in the intermediate bias regime.

Original language	English
Pages (from-to)	266-275
Number of pages	10
Journal	Chemical Physics
Volume	329
Issue number	1-3
DOIs	https://doi.org/10.1016/j.chemphys.2006.06.041
State	Published - 26 Oct 2006

Bibliographical note

Funding Information:
We gratefully thank Prof. Paola Gori-Giorgi for interesting discussions and for supplying us with the computer routines for generating the pair correlation function of the HEG. We are grateful to the PRF, the NSF and the US-Israel Binational Science foundation for their support.

Keywords

Density functional theory
Electron correlation
Molecular electronics

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10.1016/j.chemphys.2006.06.041

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abstract = "We examine the effects of self-repulsion on the predictions of charge distribution in biased molecular junctions by the local density functional theory methods. This is done using a functional with explicit long-range exchange term effects [R. Baer, D. Neuhauser, Phys. Rev. Lett. 94 (2005) 043002]. We discuss in detail the new density functional, pointing out some of the remaining difficulties in the theory. We find that in weakly coupled junctions (the typical molecular electronics case) local-density functionals fail to describe correctly the charge distribution in the intermediate bias regime.",

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AB - We examine the effects of self-repulsion on the predictions of charge distribution in biased molecular junctions by the local density functional theory methods. This is done using a functional with explicit long-range exchange term effects [R. Baer, D. Neuhauser, Phys. Rev. Lett. 94 (2005) 043002]. We discuss in detail the new density functional, pointing out some of the remaining difficulties in the theory. We find that in weakly coupled junctions (the typical molecular electronics case) local-density functionals fail to describe correctly the charge distribution in the intermediate bias regime.

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Avoiding self-repulsion in density functional description of biased molecular junctions

Abstract

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Keywords

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