Excitation spectra of two correlated electrons in a quantum dot
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.
Keywords
Cite
@article{arxiv.2112.14245,
title = {Excitation spectra of two correlated electrons in a quantum dot},
author = {T. Ihn and C. Ellenberger and K. Ensslin and Constantine Yannouleas and Uzi Landman and D. C. Driscoll and A. C. Gossard},
journal= {arXiv preprint arXiv:2112.14245},
year = {2021}
}
Comments
ICPS28 (Vienna 2006) conference paper announcing early experimental results in semiconductor quantum dots that were successfully interpreted as a signature (strong suppression of the singlet-triplet gap) of Wigner-molecule formation, in accordance with previous theoretical work and predictions; see Ref. [7] in this paper