Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Quantum Dots, Quantum Wires, Point Contacts

TT 46.10: Vortrag

Mittwoch, 3. April 2019, 17:30–17:45, H22

Interference effects in the cotunnelling transport regime — •Christoph Rohrmeier, Milena Grifoni, and Andrea Donarini — Institute of Theoretical Physics University of Regensburg, Regensburg, Germany

Interference, being intimately related to the superposition principle, plays a central role in quantum mechanics. I will report on interference effects in the transport characteristics of interacting systems in the cotunnelling regime. Particular emphasis will be given to quantum dot molecules exhibiting a quasi-degenerate spectrum. The method of choice for studying the transport characteristics is the Liouville approach. To this end, we systematically include coherences, essential to capture consistently interference effects and solve a generalized master equation for the reduced density matrix up to the fourth perturbative order in the coupling to the leads. Experimental fingerprints of such many-body quantum interference have been reported in semiconductor [1, 2] as well as in carbon nanotube based quantum dots [3]. These interacting systems certainly represents suitable candidates of experimental validation of our theory.
[1] C. Payette, et al., Phys. Rev. Lett. 102 , 026808 (2009);

[2] O. Karlström et al., Phys. Rev. B 83 , 205412 (2011);

[3] A. Donarini et al., arXiv:1804.02234, accepted for publication in Nat. Comm.