Wave-vector dependence of spin and density multipole excitations in quantum dots

Details Wave-vector dependence of spin and density multipole excitations in quantum dots Wave-vector dependence of spin and density multipole excitations in quantum dots

1999-07-21

arxiv.org/abs/cond-mat/9907321v1

PRB61,8289(2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages in REVTEX and 14 postscript figures

Scientific paper

10.1103/PhysRevB.61.8289

We have employed time-dependent local-spin density functional theory to analyze the multipole spin and charge density excitations in GaAs-AlGaAs quantum dots. The on-plane transferred momentum degree of freedom has been taken into account, and the wave-vector dependence of the excitations is discussed. In agreement with previous experiments, we have found that the energies of these modes do not depend on the transferred wave-vector, although their intensities do. Comparison with a recent resonant Raman scattering experiment [C. Sch\"uller et al, Phys. Rev. Lett {\bf 80}, 2673 (1998)] is made. This allows to identify the angular momentum of several of the observed modes as well as to reproduce their energies.

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