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- W4226040315 abstract "Large-scale arrays of quantum-dot spin qubits in Si/SiGe quantum wells require large or tunable energy splittings of the valley states associated with degenerate conduction band minima. Existing proposals to deterministically enhance the valley splitting rely on sharp interfaces or modifications in the quantum well barriers that can be difficult to grow. Here, we propose and demonstrate a new heterostructure, the Wiggle Well, whose key feature - Ge concentration oscillations - is realized inside the quantum well, rather than outside, and does not require atomic-scale precision. Experimentally, we observe large and widely tunable valley splittings from 54 to 239 ueV in a single-electron dot. Using tight-binding calculations, we make quantitative predictions for the valley splitting in several different Wiggle Well heterostructures. Our results point to the Wiggle Well as a robust method for enhancing the valley splitting in future qubit devices." @default.
- W4226040315 created "2022-05-05" @default.
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- W4226040315 date "2021-12-17" @default.
- W4226040315 modified "2023-09-27" @default.
- W4226040315 title "SiGe quantum wells with oscillating Ge concentrations for quantum dot qubits" @default.
- W4226040315 doi "https://doi.org/10.48550/arxiv.2112.09765" @default.
- W4226040315 hasPublicationYear "2021" @default.
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