TY  - EJOUR
AU  - Willmes, Alexander
AU  - Bethke, Patrick
AU  - Shehata, M. Mohamed El Kordy
AU  - Simion, George
AU  - Wolfe, M. A.
AU  - Botzem, Tim
AU  - McNeil, Robert P. G.
AU  - Ritzmann, Julian
AU  - Ludwig, Arne
AU  - Wieck, Andreas D.
AU  - Schuh, Dieter
AU  - Bougeard, Dominique
AU  - Bluhm, Hendrik
TI  - Exchange interaction in gate-defined quantum dots beyond the Hubbard model
PB  - arXiv
M1  - FZJ-2025-05225
PY  - 2025
AB  - 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.
KW  - Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
KW  - Quantum Physics (quant-ph) (Other)
KW  - FOS: Physical sciences (Other)
LB  - PUB:(DE-HGF)25
DO  - DOI:10.48550/ARXIV.2511.23277
UR  - https://juser.fz-juelich.de/record/1049133
ER  -