Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Y74: Semiconducting Qubits V
8:00 AM–11:00 AM,
Friday, March 10, 2023
Room: Room 403/404
Sponsoring
Unit:
DQI
Chair: Stefano Bosco, University of Basel
Abstract: Y74.00007 : Fine-tuning the quantum well thickness in 28Si/SiGe heterostructures*
9:36 AM–9:48 AM
Presenter:
Davide Degli Esposti
(QuTech/TU Delft)
Authors:
Davide Degli Esposti
(QuTech/TU Delft)
Lucas Stehouwer
(QuTech and Kavli Institute of Nanoscience, TU Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands)
Davide Costa
(QuTech and Kavli Institute of Nanoscience, TU Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands)
Cornelius Carlsson
(QuTech and Kavli Institute of Nanoscience, TU Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands)
Larysa Tryputen
(QuTech and TNO, Stieltjesweg 1, 2628 CK Delft, The Netherlands)
Sergey V Amitonov
(QuTech and TNO, Stieltjesweg 1, 2628 CK Delft, The Netherlands)
Amir Sammak
(QuTech and TNO, Stieltjesweg 1, 2628 CK Delft, The Netherlands)
Giordano Scappucci
(QuTech and Kavli Institute of Nanoscience, TU Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands)
Here, we fine-tune the thickness of the quantum well between the onset of strain relaxation and the increase of scattering from the bottom interface. Statistical characterization of hallbar-shaped heterostructure field effect transistors shows a substantial increase in average mobility, low percolation density, and a small spread of these parameters. In gate-defined quantum dots, we study the effects of the new features of the material stack on crucial parameters for spin qubit operation, such as charge noise, valley splitting, and device stability.
[1] Degli Esposti, D, et al., Appl. Phys. Lett. 120, 184003 (2022)
[2] Paquelet Wuetz, B, et al., arXiv:2209.07242 (2022)
*This research was supported by the European Union's Horizon 2020 research and innovation programme under the Grant Agreement No. 951852 (QLSI project)
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