Spin exciton in a quantum dot with spin-orbit coupling at high magnetic field Auteur(s): Lucignano P., Jouault B., Tagliacozzo A. (Article) Publié: Physical Review B, vol. 69 p.045314 (2004) Texte intégral en Openaccess : Ref HAL: hal-00544451_v1 DOI: 10.1103/PhysRevB.69.045314 WoS: 000189075200059 Exporter : BibTex | endNote 18 Citations Résumé: Coulomb interactions of few (N) electrons confined in a disk-shaped quantum dot, with a large magnetic field B=B-* applied in the z direction (orthogonal to the dot), produce a fully spin-polarized ground state. We numerically study the splitting of the levels corresponding to the multiplet of total spin S=N/2 (each labeled by a different total angular momentum J(z)) in the presence of an electric field parallel to B, coupled to S by a Rashba term. We find that the first excited state is a spin exciton with a reversed spin at the origin. This is reminiscent of the quantum Hall ferromagnet at filling one, which has the skyrmionlike state as its first excited state. The spin-exciton level can be tuned with the electric field and infrared radiation can provide energy and angular momentum to excite it. |