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Formulation of Long-Range Transport Rates through Molecular Bridges: from Unfurling to Hopping

סמינר כימיה פיזקאלית ואנאליטית

מרצה: Ariel Levine

תאריך:
04-04 Nov 2018 @ 12:30

מיקום: חדר סמינרים פקולטי

Abstract:

Weak fluctuations about the rigid equilibrium structure of ordered molecular bridges drive charge transfer in donor-bridge-acceptor systems via quantum unfurling [Chemical Science, 2016, 7, 1535], which differs from both hopping and/or ballistic transfer. Yet, static disorder (low frequency motions) in the bridge is shown to induce a change of mechanism from unfurling to hopping when local fluctuations along the molecular bridge are uncorrelated. Remarkably, these two different transport mechanisms manifest in similar charge transfer rates, which are nearly independent on the molecular bridge length. We propose an experimental test for distinguishing unfurling from hopping in DNA models with different helix directionality. A unified formulation explains the apparent similarity in the length dependence of the transfer rate in spite of the difference in the underlying transport mechanisms.