Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T42: Topological Superconductivity: Theory
11:30 AM–2:30 PM,
Thursday, March 9, 2023
Room: Room 318
Sponsoring
Unit:
DMP
Chair: Sheng-Jie Huang, Max Planck Institute for the Physics of Complex Systems
Abstract: T42.00012 : Fractional transconductance in a chain of Josephson junctions
2:06 PM–2:18 PM
Presenter:
Hannes Weisbrich
(University Konstanz)
Authors:
Hannes Weisbrich
(University Konstanz)
Raffael Klees
(Univ Konstanz)
Oded Zilberberg
(ETH Zurich)
Wolfgang Belzig
(Univ Konstanz)
In this work, we theoretically demonstrate how a fractional quantized transconductance can be observed in a chain of Josephson junctions. The fractional properties in this setup can be controlled by an offset flux that leads to the appearance of fractional plateaus in the transconductance for finite voltages. These plateaus can be interpreted as a fractional pumping of a Cooper pair in the chain. Finally, we demonstrate the robustness of the effect taking into account disorder along the chain.
[1] Riwar et al., Nat. Commun. 7, 11167 (2016).
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