Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Nanotubes and Nanoribbons

TT 29.3: Vortrag

Dienstag, 2. April 2019, 15:00–15:15, H2

Oscillator induced phase transition in a quantum dot Josephson junction — •Robert Hussein, Daniel Reger, and Wolfgang Belzig — Fachbereich Physik, Universität Konstanz, Germany

We investigate the Josephson transport through a suspended carbon nanotube quantum dot—acting likewise as a mechanical resonator—in the presence of an external magnetic field. At sufficiently low temperatures, the transport properties are characterized by the ground state of the electronic subsystem being either in a singlet, doublet, or current suppressing triplet state. We show that the triplet blockade can be lifted by the coupling to the resonator and study the emergence of a triple point, where all three ground states coexist. Furthermore, we demonstrate that this oscillator induced phase transition also manifests in the critical current.