%0 Journal Article
%T Spin exciton in a quantum dot with spin-orbit coupling at high magnetic field
%+ Groupe d'étude des semiconducteurs (GES)
%A Lucignano, P.
%A Jouault, Benoit
%A Tagliacozzo, A.
%< avec comité de lecture
%Z GES:04-037
%@ 1098-0121
%J Physical Review B: Condensed Matter and Materials Physics (1998-2015)
%I American Physical Society
%V 69
%P 045314
%8 2004
%D 2004
%Z cond-mat/0307016
%R 10.1103/PhysRevB.69.045314
%K MAXIMUM-DENSITY-DROPLET
%K ELECTRONIC-STRUCTURE
%K HALL FERROMAGNETS
%K COULOMB-BLOCKADE
%K HARTREE-FOCK
%K STATES
%K WELLS
%K CONDUCTANCE
%K SKYRMIONS
%K LAYERS
%Z Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Journal articles
%X 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.
%G English
%L hal-00544451
%U https://hal.science/hal-00544451
%~ CNRS
%~ UNIV-MONTP2
%~ GES
%~ UNIV-MONTPELLIER
%~ UM1-UM2