Work

Optimization of Si/SiGe Heterostructures for Large and Robust Valley Splitting in Spin Qubits

Year: 2026

Type: conference-paper

Abstract: The typically small and highly variable valley splitting is a key limitation for the scalability of silicon-germanium (SiGe) spin qubits. We present a free-shape optimization approach to engineer the Ge-concentration profile in a SiGe quantum well such that it provides a deterministic enhancement of the valley splitting with simultaneously reduced device-to-device variance. Our model is based on exact multi-valley envelope function theory augmented by a non-local empirical pseudopotential model and a random potential model describing alloy disorder.

Source: International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)

DOI: 10.1109/nusod69851.2026.11687845

Authors: Markus Kantner, Abel Thayil, Lasse Ermoneit, Thomas Koprucki

Institution: Weierstrass Institute for Applied Analysis and Stochastics

Language: English

Topic: Quantum and electron transport phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W7213430469

FWCI:

Cites: 3

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Related to: 10