Excitation spectra of two correlated electrons in a quantum dot

• URL: http://arxiv.org/abs/2112.14245v1
• Date: Tue, 28 Dec 2021 18:20:29 GMT
• Title: Excitation spectra of two correlated electrons in a quantum dot
• Authors: T. Ihn, C. Ellenberger, K. Ensslin, Constantine Yannouleas, Uzi Landman, D.C. Driscoll, A.C. Gossard
• Abstract summary: Experimentally, excited states are found beyond the well-known lowest singlet- and triplet states. These states can be reproduced in an exact diagonalization calculation of a parabolic dot with moderate in-plane anisotropy.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Measurements and a theoretical interpretation of the excitation spectrum of a two-electron quantum dot fabricated on a parabolic Ga[Al]As quantum well are reported. Experimentally, excited states are found beyond the well-known lowest singlet- and triplet states. These states can be reproduced in an exact diagonalization calculation of a parabolic dot with moderate in-plane anisotropy. The calculated spectra are in reasonable quantitative agreement with the measurement, and suggest that correlations between the electrons play a significant role in this system. Comparison of the exact results with the restricted Hartree-Fock and the generalized Heitler-London approach shows that the latter is more appropriate for this system because it can account for the spatial correlation of the electron states.

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