Multistable transport regimes and conformational changes in molecular quantum dots

Details Multistable transport regimes and conformational changes in molecular quantum dots Multistable transport regimes and conformational changes in molecular quantum dots

2002-07-22

arxiv.org/abs/cond-mat/0207513v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures (eps files)

Scientific paper

We analyse non-equilibrium transport properties of a single-state molecular quantum dot coupled to a local phonon and contacted by two electrodes. We derive the effective non-equilibrium (Keldysh) action for the phonon mode and study the structure of the saddle points, which turn out to be symmetric with respect to time inversion. Above a critical electron-phonon coupling lambda_c the effective potential for the phonon mode develops two minima in the equilibrium and three minima in the case of a finite bias voltage. For strongly interacting Luttinger liquid leads lambda_c=0. Some implications for transport experiments on molecular quantum dots are discussed.

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