Effects of charge-dependent vibrational frequencies and anharmonicities in transport through molecules
arXiv:cond-mat/0508011 · doi:10.1103/PhysRevB.72.113308
Abstract
As a step towards a more realistic modeling of vibrations in single-molecule devices, we investigate the effects of charge-dependent vibrational frequencies and anharmonic potentials on electronic transport. For weak phonon relaxation, we find that in both cases vibrational steps split into a multitude of substeps. This effectively leads to a bias-dependent broadening of vibrational features in current-voltage and conductance characteristics, which provides a fingerprint of nonequilibrium vibrations whenever other broadening mechanisms are secondary. In the case of an asymmetric molecule-lead coupling, we observe that frequency differences can also cause negative differential conductance.
4+ pages, 3 figures; accepted for publication in Phys. Rev. B. (Brief Reports)
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- Effect of nonadiabatic electronic-vibrational interactions on the transport properties of single-molecule junctions
- Vibrational effects in charge transport through a molecular double quantum dot
- Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot
- Effect of broadening in the weak coupling limit of vibrationally coupled electron transport through molecular junctions and the analogy to quantum dot circuit QED systems
- Non-Adiabatic Effects of Nuclear Motion in Quantum Transport of Electrons: A Self-Consistent Keldysh-Langevin Study
- Full counting statistics of phonon-assisted Andreev tunneling through a quantum dot coupled to normal and superconducting leads
- Strong coupling in thermoelectric nanojunctions: a reaction coordinate framework
- Vibrational Andreev bound states in magnetic molecules
- Electron transport in nanoscale junctions with local anharmonic modes
- Charge-state dependent vibrational relaxation in a single-molecule junction
- Elimination of negative differential conductance in an asymmetric molecular transistor by an ac-voltage
- Lindblad theory for incoherently-driven electron transport in molecular nanojunctions