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

Superconductor/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...

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Published in:Nature communications 2024-01, Vol.15 (1), p.169-169, Article 169
Main Authors: Valentini, Marco, Sagi, Oliver, Baghumyan, Levon, de Gijsel, Thijs, Jung, Jason, Calcaterra, Stefano, Ballabio, Andrea, Aguilera Servin, Juan, Aggarwal, Kushagra, Janik, Marian, Adletzberger, Thomas, Seoane Souto, Rubén, Leijnse, Martin, Danon, Jeroen, Schrade, Constantin, Bakkers, Erik, Chrastina, Daniel, Isella, Giovanni, Katsaros, Georgios
Format: Article
Language:English
Subjects:
639/766/119/1003
639/925/927/1064
Aluminum
Condensed Matter Physics
Cooper pairs
Den kondenserade materiens fysik
Electrical junctions
Electrons
Fysik
Germanium
Humanities and Social Sciences
Interference
Josephson junctions
multidisciplinary
Natural Sciences
Naturvetenskap
Physical Sciences
Quantum wells
Qubits (quantum computing)
Science
Science (multidisciplinary)
Superconducting quantum interference devices
Superconductivity
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Summary:Superconductor/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 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. M. Valentini et al. study superconducting quantum interference devices (SQUIDs) where the weak link of the Josephson junctions is a germanium 2D hole gas. They report signatures of the tunneling of pairs of Cooper pairs. For a particular microwave drive power, they observe a 100% efficient superconducting diode effect.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-44114-0