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TT: Fachverband Tiefe Temperaturen

TT 48: Topological Superconductors

TT 48.4: Talk

Thursday, March 30, 2023, 10:15–10:30, HSZ 304

Fractional transconductance via non-adiabatic topological Cooper pair pumping — •Hannes Weisbrich1, Raffael L. Klees2, Oded Zilberberg1, and Wolfgang Belzig11Universität Konstanz — 2Universität Würzburg

Many robust physical phenomena in quantum physics are based on topological invariants, which are intriguing geometrical properties of quantum states. A prime example is the 2D quantum Hall effect with its quantized quantum Hall conductance in units of e2/h protected by the respective 2D topology. A comparable effect in superconducting systems is the appearance of a quantized transconductance in units of 4e2/h for topological Andreev bound states in multiterminal Josephson junctions.

In this work, we theoretically demonstrate how fractional quantized plateaus in the transconductance can be observed as a result of topological Cooper pair pumping in a chain of Josephson junctions. The fractional plateaus in the transconductance are stabilized by non-adiabatic Landau-Zener transitions which even allow for a robustness to disorder in the chain.

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