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

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

2001-06-26

arxiv.org/abs/cond-mat/0106538v1

Phys. Rev. B, 64 (2001) 155304

Physics

Condensed Matter

Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.155304

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 electro-chemical 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.

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