Pair tunneling through single molecules

Details Pair tunneling through single molecules Pair tunneling through single molecules

2005-10-10

arxiv.org/abs/cond-mat/0510249v2

Phys. Rev. Lett. 96, 056803 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 4 figures; minor changes, version published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.056803

By a polaronic energy shift, the effective charging energy of molecules can become negative, favoring ground states with even numbers of electrons. Here, we show that charge transport through such molecules near ground-state degeneracies is dominated by tunneling of electron pairs which coexists with (featureless) single-electron cotunneling. Due to the restricted phase space for pair tunneling, the current-voltage characteristics exhibits striking differences from the conventional Coulomb blockade. In asymmetric junctions, pair tunneling can be used for gate-controlled current rectification and switching.

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