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Journal Articles Physical Review B: Condensed Matter (1978-1997) Year : 2019

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

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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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hal-03019045 , version 1 (23-11-2020)

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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), 2019, pp.024308. ⟨10.1103/PhysRevB.100.024308⟩. ⟨hal-03019045⟩
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