Electron Transport Through Molecules: Gate Induced Polarization and Potential Shift

Details Electron Transport Through Molecules: Gate Induced Polarization and Potential Shift Electron Transport Through Molecules: Gate Induced Polarization and Potential Shift

2004-06-25

arxiv.org/abs/cond-mat/0406640v1

Phys. Rev. B 71, 113401 (2005)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.113401

We analyze the effect of a gate on the conductance of molecules by separately evaluating the gate-induced polarization and the potential shift of the molecule relative to the leads. The calculations use ab initio density functional theory combined with a Green function method for electron transport. For a general view, we study several systems: (1) atomic chains of C or Al sandwiched between Al electrodes, (2) a benzene molecule between Au leads, and (3) (9,0) and (5,5) carbon nanotubes. We find that the polarization effect is small because of screening, while the effect of the potential shift is significant, providing a mechanism for single-molecule transistors.

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