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oai:recercat.cat:2445/104852025-12-05T16:47:46Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Barranco Gómez, Manuel author Colletti, Leonardo author Lipparini, Enrico author Emperador, Agustí author Pi Pericay, Martí author Serra, Llorenç author 2009-12-24T10:30:10Z 2009-12-24T10:30:10Z 2000 We have employed time-dependent local-spin density-functional theory to analyze the multipole spin and charge density excitations in GaAs-AlxGa1-xAs 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. 80, 2673 (1998)] is made. This allows us to identify the angular momentum of several of the observed modes as well as to reproduce their energies Teoria del funcional de densitat Electrònica quàntica Semiconductors Fenòmens mesoscòpics (Física) Transport d'electrons Density functional theory Quantum electronics Semiconductors Mesoscopic phenomena (Physics) Electron transport Wave-vector dependence of spin and density multipole excitations in quantum dots