Phonon-assisted tunneling regimes in diatomic molecules

Details Phonon-assisted tunneling regimes in diatomic molecules Phonon-assisted tunneling regimes in diatomic molecules

2007-01-15

arxiv.org/abs/cond-mat/0701356v1

Phys. Rev. B 76, 075320 (2007).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 figures - 8 pages. submitted to PRB

Scientific paper

10.1103/PhysRevB.76.075320

Electronic transport in diatomic molecules (two-level systems) connected to metallic contacts is analyzed in the presence of competing electron-electron and electron-phonon interactions. We show that phonon emission and absorption processes are strongly modified when a Coulomb energy $U$ is included, as the phonons open channels that can result in destructive or constructive interference effects. Resonance conditions for these processes produce dramatic effects both in the density of states at the molecular sites, as well as in the conductance through the system. We find in particular an enhanced {\it Rabi-assisted tunneling} due to phonons, as the resonance conditions are met, which is made more evident for increasing temperatures. These effects are controllable by voltage gating of the molecular sites, and should be accessible in current experiments.

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