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Interface and electromagnetic effects in the valley splitting of Si quantum dots

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2023

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Institutionen der Bundesrepublik Deutschland: 13N15657

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Materials for Quantum Technology. IOP Publishing. 2023, 3(2), 025004. eISSN 2633-4356. Verfügbar unter: doi: 10.1088/2633-4356/acd743

Zusammenfassung

The performance and scalability of silicon spin qubits depend directly on the value of the conduction band valley splitting (VS). In this work, we investigate the influence of electromagnetic fields and the interface width on the VS of a quantum dot in a Si/SiGe heterostructure. We propose a new three-dimensional theoretical model within the effective mass theory for the calculation of the VS in such heterostructures that takes into account the concentration fluctuation at the interfaces and the lateral confinement. With this model, we predict that the electric field is an important parameter for VS engineering, since it can shift the probability distribution away from small VSs for some interface widths. We also obtain a critical softness of the interfaces in the heterostructure, above which the best option for spin qubits is to consider an interface as wide as possible.

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530 Physik

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valley splitting, quantum dot, silicon spin qubits, interface effects

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ISO 690LIMA, Jonas R. F., Guido BURKARD, 2023. Interface and electromagnetic effects in the valley splitting of Si quantum dots. In: Materials for Quantum Technology. IOP Publishing. 2023, 3(2), 025004. eISSN 2633-4356. Verfügbar unter: doi: 10.1088/2633-4356/acd743
BibTex
@article{Lima2023-06-01Inter-71379,
  year={2023},
  doi={10.1088/2633-4356/acd743},
  title={Interface and electromagnetic effects in the valley splitting of Si quantum dots},
  number={2},
  volume={3},
  journal={Materials for Quantum Technology},
  author={Lima, Jonas R. F. and Burkard, Guido},
  note={Article Number: 025004}
}
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