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 W74: Semiconducting Qubits IV
3:00 PM–6:00 PM,
Thursday, March 9, 2023
Room: Room 403/404
Sponsoring
Unit:
DQI
Chair: Andrey Kiselev, HRL Laboratories, LLC
Abstract: W74.00002 : Modelling of planar germanium hole qubits in electric and magnetic fields*
3:36 PM–3:48 PM
Presenter:
Maximilian Russ
(Delft University of Technology)
Authors:
Maximilian Russ
(Delft University of Technology)
Chien-An Wang
(Delft University of Technology)
Giordano Scappucci
(Delft University of Technology)
Menno Veldhorst
(Delft University of Technology)
In this talk we show simulations of a heterostructure hosting these hole spin qubits [1]. We solve the effective mass equations for a realistic heterostructure, provide a set of analytical basis wave functions, and compute the effective g-factor of the heavy-hole ground-state. Our investigations reveal a strong impact of highly excited light hole states located outside the quantum well on the g-factor. We find that sweet spots in out-of-plane magnetic fields are shifted to impractically large electric fields. However, for magnetic fields close to in-plane alignment, sweet spots at low electric fields are recovered. This work will be helpful in understanding and improving coherence of germanium hole spin qubits.
[1] Wang, Scappucci, Veldhorst and Russ, arXiv:2208.04795
*C.W. M. V. acknowledge support through an ERC Starting Grant. Research was sponsored by the Army Research Office (ARO) and was accomplished under Grant No. W911NF- 17-1-0274. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office (ARO), or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. M.R. acknowledges support from the Netherlands Organization of Scientific Research (NWO) under Veni grant VI.Veni.212.223.
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