Tunneling broadening of vibrational sidebands in molecular transistors

Abstract

Transport through molecular quantum dots coupled to a single vibration mode is studied in the case with strong coupling to the leads. We use an expansion in the correlation between electrons on the molecule and electrons in the leads and show that the tunneling broadening is strongly suppressed by the combination of the Pauli principle and the quantization of the oscillator. As a consequence the first Frank-Condon step is sharper than the higher order ones, and its width, when compared to the bare tunneling strength, is reduced by the overlap between the groundstates of the displaced and the non-displaced oscillator.

8 pages, 3 figures. PRB, in press

References in corpus (2)

• Vibrational sidebands and dissipative tunneling in molecular transistors
• Current hysteresis and memory effect in a molecular quantum dot with strong electron-vibron interaction

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