Abstract
Quantum interference (QI) can lead to large variations in single molecule conductance. However, controlling QI using external stimuli is challenging. The molecular structure of phenoxyquinone can be tuned reversibly using light stimulus. In this paper, we show that this can be utilized to control QI in phenoxyquinone derivatives. Our calculations indicate that, as a result of such variation in molecular structure of phenoxyquinone, a crossover from destructive to constructive QI is induced. This leads to a significant variation in the single molecule conductance by a couple of orders of magnitude. This control of QI using light is a new paradigm in photosensitive single molecule switches and opens new avenues for future QI-based photoswitches.
Highlights
Studying charge transport through molecular devices has attracted a growing interest in the last decade [1,2,3]
The electrical conductance G = G0T(EF) and current I are obtained from Landauer formula
Note that room temperature electrical conductance is obtained from thermal averaging of transmission function using Fermi distribution
Summary
Studying charge transport through molecular devices has attracted a growing interest in the last decade [1,2,3]. This leads to changes in the electrical conductance of the molecule between two electrodes.
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