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Multipole modes and spin features in the Raman spectrum of nanoscopic quantum rings
Emperador, Agustí; Pi Pericay, Martí; Barranco Gómez, Manuel; Lipparini, Enrico
Universitat de Barcelona
We present a systematic study of ground state and spectroscopic properties of many-electron nanoscopic quantum rings. Addition energies at zero magnetic field (B) and electrochemical potentials as a function of B are given for a ring hosting up to 24 electrons. We find discontinuities in the excitation energies of multipole spin and charge density modes, and a coupling between the charge and spin density responses that allow to identify the formation of ferromagnetic ground states in narrow magnetic field regions. These effects can be observed in Raman experiments, and are related to the fractional Aharonov-Bohm oscillations of the energy and of the persistent current in the ring
04-05-2010
Espectroscòpia Raman
Semiconductors
Raman spectroscopy
Semiconductors
(c) The American Physical Society, 2001
Artículo
The American Physical Society
         

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