Modeling Si/SiGe quantum dot variability induced by interface disorder reconstructed from multiperspective microscopy

Peña, Luis Fabián; Koepke, Justine C.; Dycus, Joseph Houston; Mounce, Andrew; Baczewski, Andrew D.; Jacobson, N. Tobias; Bussmann, Ezra

doi:10.1038/s41534-024-00827-8

Title: Modeling Si/SiGe quantum dot variability induced by interface disorder reconstructed from multiperspective microscopy

Journal Article · 26 March 2024 · npj Quantum Information

DOI: https://doi.org/10.1038/s41534-024-00827-8 · OSTI ID:2329339

; Koepke, Justine C.; Dycus, Joseph Houston; Mounce, Andrew;

;

Abstract SiGe heteroepitaxial growth yields pristine host material for quantum dot qubits, but residual interface disorder can lead to qubit-to-qubit variability that might pose an obstacle to reliable SiGe-based quantum computing. By convolving data from scanning tunneling microscopy and high-angle annular dark field scanning transmission electron microscopy, we reconstruct 3D interfacial atomic structure and employ an atomistic multi-valley effective mass theory to quantify qubit spectral variability. The results indicate (1) appreciable valley splitting (VS) variability of ~50% owing to alloy disorder and (2) roughness-induced double-dot detuning bias energy variability of order 1–10 meV depending on well thickness. For measured intermixing, atomic steps have negligible influence on VS, and uncorrelated roughness causes spatially fluctuating energy biases in double-dot detunings potentially incorrectly attributed to charge disorder. Our approach yields atomic structure spanning orders of magnitude larger areas than post-growth microscopy or tomography alone, enabling more holistic predictions of disorder-induced qubit variability.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0023412

OSTI ID:: 2329339

Alternate ID(s):: OSTI ID: 2331260; OSTI ID: 2472770

Journal Information:: npj Quantum Information, Journal Name: npj Quantum Information Journal Issue: 1 Vol. 10; ISSN 2056-6387

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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