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Spin and density longitudinal response of quantum dots in the time-dependent local-spin-density approximation
Serra, Llorenç; Barranco Gómez, Manuel; Emperador, Agustí; Pi Pericay, Martí; Lipparini, Enrico
Universitat de Barcelona
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 sizable 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 (v) related. We have found that the spin dipole mode is especially soft for even-n values. Results for selected numbers of electrons and confining potentials are discussed.
04-05-2010
Matèria condensada
Superfícies (Física)
Propietats elèctriques
Condensed matter
Surfaces (Physics)
Electric properties
(c) The American Physical Society, 1999
Artículo
The American Physical Society
         

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