Dynamical symmetry breaking in transport through molecules

Details Dynamical symmetry breaking in transport through molecules Dynamical symmetry breaking in transport through molecules

2006-05-04

arxiv.org/abs/cond-mat/0605123v2

Phys. Rev. Lett. 97, 166801 (2006)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures, revised final published version

Scientific paper

10.1103/PhysRevLett.97.166801

We analyze the interplay between vibrational and electronic degrees of freedom in charge transport across a molecular single-electron transistor. We focus on the wide class of molecules which possess quasi-degenerate vibrational eigenstates, while no degeneracy occurs for their anionic configuration. We show that the combined effect of a thermal environment and coupling to leads, involving tunneling events charging and discharging the molecule, leads to a dynamical symmetry breaking where quasi-degenerate eigenstates acquire different occupations. This imbalance gives rise to a characteristic asymmetry of the current versus an applied gate voltage.

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