Deleterious Effects of Exact Exchange Functionals on Predictions of Molecular Conductance

Qingguo Feng, Atsushi Yamada, Roi Baer*, Barry D. Dunietz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Kohn-Sham (KS) density functional theory (DFT) describes well the atomistic structure of molecular junctions and their coupling to the semi-infinite metallic electrodes but severely overestimates conductance due to the spuriously large density of charge-carrier states of the KS system. Previous works show that inclusion of appropriate amounts of nonlocal exchange in the functional can fix the problem and provide realistic conductance estimates. Here however we discover that nonlocal exchange can also lead to deleterious effects which artificially overestimate transmittance even beyond the KS-DFT prediction. The effect is a result of exchange coupling between nonoverlapping states of diradical character. We prescribe a practical recipe for eliminating such artifacts.

Original languageAmerican English
Pages (from-to)3431-3435
Number of pages5
JournalJournal of Chemical Theory and Computation
Volume12
Issue number8
DOIs
StatePublished - 9 Aug 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

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