@article{14793,
  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, creating a sin(2y) 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.},
  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 L 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},
  journal      = {Nature Communications},
  publisher    = {Springer Nature},
  title        = {{Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium}},
  doi          = {10.1038/s41467-023-44114-0},
  volume       = {15},
  year         = {2024},
}

@unpublished{13312,
  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, creating a $ \sin
\left( 2 \varphi \right)$ CPR. Shapiro experiments complement this
interpretation and the microwave drive allows to create a diode with $ \approx
100 \%$ efficiency. The reported results open up the path towards monolithic
integration of spin qubit devices, microwave resonators and (protected)
superconducting qubits on a silicon technology compatible platform.},
  author       = {Valentini, Marco and Sagi, Oliver and Baghumyan, Levon and Gijsel, Thijs de and Jung, Jason and Calcaterra, Stefano and Ballabio, Andrea and Servin, Juan Aguilera and Aggarwal, Kushagra and Janik, Marian and Adletzberger, Thomas and Souto, Rubén Seoane and Leijnse, Martin and Danon, Jeroen and Schrade, Constantin and Bakkers, Erik and Chrastina, Daniel and Isella, Giovanni and Katsaros, Georgios},
  booktitle    = {arXiv},
  keywords     = {Mesoscale and Nanoscale Physics},
  title        = {{Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas}},
  doi          = {10.48550/arXiv.2306.07109},
  year         = {2023},
}