SKM 2023 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Nonequilibrium Quantum Many-Body Systems II (joint session TT/DY)

DY 30.9: Talk

Wednesday, March 29, 2023, 17:15–17:30, HSZ 204

Vibrationally-coupled electron transport in a quantum shuttle: A study using the hierarchical equations of motion approach — •Salvatore Gatto, Christoph Kaspar, and Michael Thoss — Institute of Physics, Albert-Ludwigs-Universität Freiburg

A quantum shuttle is an archetypical nanoelectromechanical device, in which the coupling of electronic and mechanical degrees of freedom is crucial [1]. In this contribution, we investigate transport properties of quantum shuttles, with a particular focus to the so-called shuttling regime, in which the transport of electrons is synchronized with the mechanical motion. The transport characteristics are strongly influenced by the interplay of electronic and vibrational degrees of freedom, which manifests itself in step structures of the current-voltage characteristics. An effective molecule-lead coupling results in an increase of the current with respect to the tunneling regime. The study uses the hierarchical equations of motion approach, which allows a numerically exact simulation of nonequilibrium transport in general open quantum systems involving multiple bosonic and fermionic environments [2].
[1] Novotný et al., Phys. Rev. Lett. 92, 248302 (2004)
[2] J. Bätge, Y. Ke, C. Kaspar, and M. Thoss, Phys. Rev. B 103, 235413 (2021)