Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium

Author:

Valentini Marco,Sagi Oliver,Baghumyan Levon,de Gijsel ThijsORCID,Jung Jason,Calcaterra Stefano,Ballabio Andrea,Aguilera Servin JuanORCID,Aggarwal KushagraORCID,Janik Marian,Adletzberger Thomas,Seoane Souto RubénORCID,Leijnse Martin,Danon Jeroen,Schrade Constantin,Bakkers ErikORCID,Chrastina DanielORCID,Isella Giovanni,Katsaros GeorgiosORCID

Abstract

AbstractSuperconductor/semiconductor hybrid devices have attracted increasing interest in the past years. Superconducting electronics aims to complement semiconductor technology, while hybrid architectures are at the forefront of new ideas such as topological superconductivity and protected qubits. In this work, we engineer the induced superconductivity in two-dimensional germanium hole gas by varying the distance between the quantum well and the aluminum. We demonstrate a hard superconducting gap and realize an electrically and flux tunable superconducting diode using a superconducting quantum interference device (SQUID). This allows to tune the current phase relation (CPR), to a regime where single Cooper pair tunneling is suppressed, creating a $$\sin \left(2\varphi \right)$$ sin 2 φ CPR. Shapiro experiments complement this interpretation and the microwave drive allows to create a diode with ≈ 100% efficiency. The reported results open up the path towards integration of spin qubit devices, microwave resonators and (protected) superconducting qubits on  the same silicon technology compatible platform.

Funder

NOMIS Stiftung

EC | Horizon 2020 Framework Programme

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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