%0 Electronic Article
%A Willmes, Alexander
%A Bethke, Patrick
%A Shehata, M. Mohamed El Kordy
%A Simion, George
%A Wolfe, M. A.
%A Botzem, Tim
%A McNeil, Robert P. G.
%A Ritzmann, Julian
%A Ludwig, Arne
%A Wieck, Andreas D.
%A Schuh, Dieter
%A Bougeard, Dominique
%A Bluhm, Hendrik
%T Exchange interaction in gate-defined quantum dots beyond the Hubbard model
%I arXiv
%M FZJ-2025-05225
%D 2025
%X 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.
%K Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
%K Quantum Physics (quant-ph) (Other)
%K FOS: Physical sciences (Other)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.48550/ARXIV.2511.23277
%U https://juser.fz-juelich.de/record/1049133