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• W3092444570 abstract "Silicon-quantum-dot qubits must contend with low-lying valley excited states that are sensitive functions of the quantum-well heterostructure and disorder; quantifying and maximizing the energies of these states are critical to improving device performance. We describe a spectroscopic method for probing excited states in isolated $mathrm{Si}$/$mathrm{Si}$-$mathrm{Ge}$ double quantum dots using standard baseband pulsing techniques, easing the extraction of energy spectra in multiple-dot devices. We use this method to measure dozens of valley excited-state energies spanning multiple wafers, quantum dots, and orbital states, which are crucial for evaluating the dependence of valley splitting on quantum well width and other epitaxial conditions. Our results suggest that narrower wells can be beneficial for increasing valley splittings, but this effect can be confounded by variations in growth and fabrication conditions. These results underscore the importance of valley-splitting measurements for guiding the development of $mathrm{Si}$ qubits." @default.
• W3092444570 created "2020-10-15" @default.
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• W3092444570 date "2021-04-21" @default.
• W3092444570 modified "2023-10-18" @default.
• W3092444570 title "Detuning Axis Pulsed Spectroscopy of Valley-Orbital States in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:mi>Si</mml:mi></mml:math> / <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:mi>Si</mml:mi></mml:math> - <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:mi>Ge</mml:mi></mml:math> Quantum Dots" @default.
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• W3092444570 doi "https://doi.org/10.1103/physrevapplied.15.044033" @default.
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