Exchange interaction in gate-defined quantum dots beyond the Hubbard model
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arXiv
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| Hauptverfasser: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912736090259456 |
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| author | Willmes, Alexander Bethke, Patrick Shehata, M. Mohamed El Kordy Simion, George Wolfe, M. A. Botzem, Tim McNeil, Robert P. G. Ritzmann, Julian Ludwig, Arne Wieck, Andreas D. Schuh, Dieter Bougeard, Dominique Bluhm, Hendrik |
| author_facet | Willmes, Alexander Bethke, Patrick Shehata, M. Mohamed El Kordy Simion, George Wolfe, M. A. Botzem, Tim McNeil, Robert P. G. Ritzmann, Julian Ludwig, Arne Wieck, Andreas D. Schuh, Dieter Bougeard, Dominique Bluhm, Hendrik |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_23277 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exchange interaction in gate-defined quantum dots beyond the Hubbard model Willmes, Alexander Bethke, Patrick Shehata, M. Mohamed El Kordy Simion, George Wolfe, M. A. Botzem, Tim McNeil, Robert P. G. Ritzmann, Julian Ludwig, Arne Wieck, Andreas D. Schuh, Dieter Bougeard, Dominique Bluhm, Hendrik Mesoscale and Nanoscale Physics Quantum Physics 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. |
| title | Exchange interaction in gate-defined quantum dots beyond the Hubbard model |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2511.23277 |