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33644983821
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note
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We employ the PBE generalized gradient functional, the Γ-point approximation, double ζ-polarized (DZP) basis sets for the atoms of the molecule, single ζ-polarized (SZP) for the Au atoms, and a real space grid energy cutoff of 200 Ry.
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33644988804
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note
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21 and artificial direct coupling between the contacts caused by the periodic boundary conditions removed.
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29644448212
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Viljas, J.K.1
Cuevas, J.C.2
Pauly, F.3
Häfner, M.4
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33644982016
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note
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The LOE approximations were confirmed to be quantitatively accurate by comparison to the inelastic signal from the full SCBA solution for the following two test systems: (i) a simple two-level model designed to mimic the HOMO-LUMO of a molecule and (ii) the OPE molecule described within DFT but with a minimal basis set, limited to the 10 most important vibrational modes, and a device and vibrational subspace only consisting of the molecule. Full SCBA calculations on larger systems are computationally infeasible. The SCBA calculations on the OPE molecule required approximately 100 CPU hours (P4 processors).
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25
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33644983555
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note
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The relaxed geometries used in this work have the sulfur atom at the hollow position on the Au(111) surface. We cannot rule out that different Au-S bonding configurations will give qualitatively different inelastic signals for the Au-S vibration. However, in one test calculation, we found the on-top position to be unstable for the OPE molecule.
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26
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33644989926
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note
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The LOE approximation gives a bias independent elastic conductance. Retaining the bias dependence in the elastic conductance may contribute significantly to the background signal.
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