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

Valentini, Marco ; Sagi, Oliver ; Baghumyan, Levon ; de Gijsel, Thijs ; Jung, Jason ; Calcaterra, Stefano ; Ballabio, Andrea ; Aguilera Servin, Juan ; Aggarwal, Kushagra and Janik, Marian , et al. (2024) In Nature Communications 15(1).
Abstract

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,... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
15
issue
1
article number
169
publisher
Nature Publishing Group
external identifiers
  • pmid:38167818
  • scopus:85181236077
ISSN
2041-1723
DOI
10.1038/s41467-023-44114-0
language
English
LU publication?
yes
id
607146cb-cd32-40f1-b36b-15e4070ebca9
date added to LUP
2024-02-09 13:12:16
date last changed
2024-04-25 16:06:41
@article{607146cb-cd32-40f1-b36b-15e4070ebca9,
  abstract     = {{<p>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.</p>}},
  author       = {{Valentini, Marco and Sagi, Oliver and Baghumyan, Levon and de Gijsel, Thijs and Jung, Jason and Calcaterra, Stefano and Ballabio, Andrea and Aguilera Servin, Juan and Aggarwal, Kushagra and Janik, Marian and Adletzberger, Thomas and Seoane Souto, Rubén and Leijnse, Martin and Danon, Jeroen and Schrade, Constantin and Bakkers, Erik and Chrastina, Daniel and Isella, Giovanni and Katsaros, Georgios}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium}},
  url          = {{http://dx.doi.org/10.1038/s41467-023-44114-0}},
  doi          = {{10.1038/s41467-023-44114-0}},
  volume       = {{15}},
  year         = {{2024}},
}