Multipole modes and spin features in the Raman spectrum of nanoscopic quantum rings

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Título:	Multipole modes and spin features in the Raman spectrum of nanoscopic quantum rings
Autor/a:	Emperador, Agustí; Pi Pericay, Martí; Barranco Gómez, Manuel; Lipparini, Enrico
Otros autores:	Universitat de Barcelona
Abstract:	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
Materia(s):	-Espectroscòpia Raman -Semiconductors -Raman spectroscopy -Semiconductors
Derechos:	(c) The American Physical Society, 2001
Tipo de documento:	Artículo Artículo - Versión publicada
Editor:	The American Physical Society
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Emperador, Agustí; Barranco Gómez, Manuel; Lipparini, Enrico; Pi Pericay, Martí; Serra, Llorenç

Pi Pericay, Martí; Barranco Gómez, Manuel; Emperador, Agustí; Lipparini, Enrico; Serra, Llorenç

Emperador, Agustí; Pi Pericay, Martí; Barranco Gómez, Manuel; Lipparini, Enrico; Serra, Llorenç

Serra, Llorenç; Barranco Gómez, Manuel; Emperador, Agustí; Pi Pericay, Martí; Lipparini, Enrico

Lipparini, Enrico; Barranco Gómez, Manuel; Emperador, Agustí; Pi Pericay, Martí; Serra, Llorenç

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