SKM 2023 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

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 Belzig¹ — ¹Universität 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.