TY - JOUR
T1 - Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium
AU - Valentini, Marco
AU - Sagi, Oliver
AU - Baghumyan, Levon
AU - de Gijsel, Thijs
AU - Jung, Jason
AU - Calcaterra, Stefano
AU - Ballabio, Andrea
AU - Aguilera Servin, Juan
AU - Aggarwal, Kushagra
AU - Janik, Marian
AU - Adletzberger, Thomas
AU - Seoane Souto, Rubén
AU - Leijnse, Martin
AU - Danon, Jeroen
AU - Schrade, Constantin
AU - Bakkers, Erik
AU - Chrastina, Daniel
AU - Isella, Giovanni
AU - Katsaros, Georgios
N1 - Publisher Copyright:
© 2024, The Author(s).
PY - 2024/12
Y1 - 2024/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85181236077&partnerID=8YFLogxK
U2 - 10.1038/s41467-023-44114-0
DO - 10.1038/s41467-023-44114-0
M3 - Article
C2 - 38167818
AN - SCOPUS:85181236077
SN - 2041-1723
VL - 15
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 169
ER -