Physics – Condensed Matter
Scientific paper
1998-06-08
Phys. Rev. B59,(1999) 15290
Physics
Condensed Matter
We have added some new references and minor changes on the mnuscript have been made
Scientific paper
10.1103/PhysRevB.59.15290
The longitudinal dipole response of a quantum dot has been calculated in the far-infrared regime using local spin density functional theory. We have studied the coupling between the collective spin and density modes as a function of the magnetic field. We have found that the spin dipole mode and single particle excitations have a sizeable overlap, and that the magnetoplasmon modes can be excited by the dipole spin operator if the dot is spin polarized. The frequency of the dipole spin edge mode presents an oscillation which is clearly filling factor ($\nu$) related. We have found that the spin dipole mode is especially soft for even $\nu$ values, becoming unstable for magnetic fields in the region $1 < \nu \leq 2$. Results for selected number of electrons and confining potentials are discussed. An analytical model which reproduces the main features of the microscopic spectra has been developed.
Barranco Manuel
Emperador Agusti
Lipparini Enrico
Pi Marti
Serra Ll.
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