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

Abstract

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. Schüller 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.

14 pages in REVTEX and 14 postscript figures

References in corpus (5)

• Observation of Collective Excitations of the Dilute 2D Electron System
• Spin and density longitudinal response of quantum dots in time-dependent local-spin-density approximation
• Magnetoplasmons in quantum rings
• Far-infrared edge modes in quantum dots
• Transverse dipole spin modes in quantum dots

Cited by in corpus (8)

• Evidence of correlation in spin excitations of few-electron quantum dots
• Multipole modes and spin features in the Raman spectrum of nanoscopic quantum rings
• Electronic Raman scattering in quantum dots revisited
• Semiquantitative theory of electronic Raman scattering from medium-size quantum dots
• Resonant Raman scattering off neutral quantum dots
• Inelastic light scattering and the off-resonance approximation
• Inelastic light scattering and the excited states of many-electron quantum dots
• Elementary excitations in charge-tunable InGaAs quantum dots studied by resonant Raman and resonant photoluminescence spectroscopy