Dynamical symmetry breaking in transport through molecules |
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Authors: | Donarini Andrea Grifoni Milena Richter Klaus |
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Institution: | Theoretische Physik, Universit?t Regensburg, Regensburg, Germany. |
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Abstract: | 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 quasidegenerate 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 quasidegenerate eigenstates acquire different occupations. This imbalance gives rise to a characteristic asymmetry of the current versus an applied gate voltage. |
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