Preprint

FZJ-2025-05225

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Exchange interaction in gate-defined quantum dots beyond the Hubbard model

Willmes, A. (Corresponding author)FZJ* ; Bethke, P. ; Shehata, M. M. E. K. ; Simion, G. ; Wolfe, M. A. ; Botzem, T. ; McNeil, R. P. G. ; Ritzmann, J. ; Ludwig, A. ; Wieck, A. D. ; Schuh, D. ; Bougeard, D. ; Bluhm, H.FZJ*

2025
arXiv

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Please use a persistent id in citations: doi:10.48550/ARXIV.2511.23277

Abstract: A quantitative description of the exchange interaction in quantum dots is relevant for modeling gate operations of spin qubits. By measuring the amplitude and frequency of exchange-driven qubit state oscillations, we measure the detuning dependence of the exchange coupling in a GaAs double quantum dot over three orders of magnitude. Both 1D and 3D full configuration interaction simulations can replicate the observed behavior. Extending a Hubbard model by including excited states increases the range of detuning where it provides a good fit, thus elucidating the underlying physics.

Keyword(s): Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ; Quantum Physics (quant-ph) ; FOS: Physical sciences

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Contributing Institute(s):

1. JARA Institut Quanteninformation (PGI-11)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)

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