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Asymmetry induces long-lasting energy current transients inside molecular loop circuits

Abstract : Energy transport and conversion at nanoscale have become an important topic of fundamental and applied research, in particular for conceiving groundbreaking solutions in energy-aware digital electronics and energy production. In this work, we propose a formal framework to address time-dependent energy transport inside quantum networks. The approach permits us to investigate how energy transferred to electrons by a femtosecond laser pulse is stored and released in a molecular circuit consisting of two donor-acceptor branches connected to an acceptor chain. Additionally, the two donors may be coupled, creating a loop inside the circuit. Time-resolved analysis reveals that when a difference exists between the two donor-acceptor branches, a loop current occurs and persists during relaxation, while only a small amount of current flows through the acceptor chain. A long-lasting energy flow thus emerges from the asymmetry of the molecular structure.
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https://hal-amu.archives-ouvertes.fr/hal-03019045
Contributor : Fabienne Michelini <>
Submitted on : Monday, November 23, 2020 - 11:07:48 AM
Last modification on : Monday, March 29, 2021 - 3:08:10 PM
Long-term archiving on: : Wednesday, February 24, 2021 - 6:48:41 PM

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PhysRevB.100.024308.pdf
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Fabienne Michelini, Katawoura Beltako. Asymmetry induces long-lasting energy current transients inside molecular loop circuits. Physical Review B: Condensed Matter (1978-1997), American Physical Society, 2019, pp.024308. ⟨10.1103/PhysRevB.100.024308⟩. ⟨hal-03019045⟩

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