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- W2088892525 abstract "We study the interplay of polaronic effect and superconductivity in transport through molecular Josephson junctions. The tunneling rates of electrons are dominated by vibronic replicas of the superconducting gap, which show up as prominent features in the differential conductance for the dc and ac current. For relatively large molecule-lead coupling, a features that appears when the Josephson frequency matches the vibron frequency can be identified with an over-the-gap structure observed by Marchenkov et al. [Nat. Nanotech. 2, 481 (2007)]. However, we are more concerned with the weak-coupling limit, where resonant tunneling through the molecular level dominates. We find that certain features involving both Andreev reflection and vibron emission show an unusual shift of the bias voltage $V$ at their maximum with the gate voltage ${V}_{g}$ as $Vensuremath{sim}(2/3)phantom{rule{0.16em}{0ex}}{V}_{g}$. Moreover, due to the polaronic effect, the ac Josephson current shows a phase shift of $ensuremath{pi}$ when the bias $eV$ is increased by one vibronic energy quantum $ensuremath{hbar}{ensuremath{omega}}_{v}$. This distinctive even-odd effect is explained in terms of the different sign of the coupling to vibrons of electrons and of Andreev-reflected holes." @default.
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- W2088892525 date "2012-07-05" @default.
- W2088892525 modified "2023-09-25" @default.
- W2088892525 title "Polaron effects on the dc- and ac-tunneling characteristics of molecular Josephson junctions" @default.
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- W2088892525 doi "https://doi.org/10.1103/physrevb.86.035406" @default.
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