Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Quantum Dots, Quantum Wires, Point Contacts

TT 13.4: Vortrag

Dienstag, 6. September 2022, 10:15–10:30, H23

Jahn-Teller effects in charge transport through single-molecule junctions: a hierarchical equation of motion approach — •Christoph Kaspar and Michael Thoss — University of Freiburg

Molecules with degenerate electronic states may exhibit Jahn-Teller effects [1]. In this contribution, we investigate charge transport through such molecules bound to metal electrodes within a molecular junction [2]. The study employs the hierarchical equation of motion approach [3,4] to open quantum system dynamics. This method generalizes perturbative master equation methods by including higher-order contributions as well as non-Markovian memory, thus allowing for a systematic convergence of the results. Extending previous studies [5], we find that the molecule can become trapped in a nonconducting state resulting in a current-blockade, out of which only higher-order processes such as cotunneling provide an escape mechanism.
[1] M. O’Brien et al., Am. J. Phys. 61, 688 (1993)
[2] C. Kaspar et al., Phys. Rev. B 105, 195435 (2022)
[3] Y. Tanimura, J. Chem. Phys. 153, 020901 (2020)
[4] C. Schinabeck et al., Phys. Rev. B 94, 201407R (2016)
[5] M. Schultz et al., Phys. Rev. B 77, 075323 (2008)