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Wave-vector dependence of spin and density multipole excitations in quantum dots
Barranco Gómez, Manuel; Colletti, Leonardo; Lipparini, Enrico; Emperador, Agustí; Pi Pericay, Martí; Serra, Llorenç
Universitat de Barcelona
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
04-05-2010
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
(c) The American Physical Society, 2000
Article
The American Physical Society
         

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