Journal
PHYSICAL REVIEW B
Volume 78, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.235420
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Funding
- Grants-in-Aid for Scientific Research [20613002] Funding Source: KAKEN
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We describe the ab initio nonequilibrium Green's function method for electron-transport calculations in nanoscale devices based on the efficient molecular-orbital approach. This is implemented in the density-functional theory code SIESTA with the additional option of including effects originating from electron-phonon coupling. We also derive simple expressions for the conductance and the inelastic electron tunneling spectrum (IETS) based on the rigorous lowest-order expansion formalism. In order to illustrate our method, we have performed calculations of inelastic transport in a linear gold atomic wire and a benzene-dithiol molecule both sandwiched between gold electrodes. In the latter case the leads have been constrained to maintain an overall D-2h symmetry, as typical of both high- and low-conductance systems. The shapes of the IETS, the effect of the temperature, and of the symmetry of the IETS signals are analyzed in details.
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