Optical-absorption spectra of quantum dots and rings with a repulsive scattering centre
Theoretical Physics, University of Oulu - Fin-90570 Oulu, Finland
2 Institute of Mathematical Sciences - Taramani, Madras 600113, India
Accepted: 20 December 1995
We have studied electron correlation effects in quantum dots and rings which include a repulsive scattering centre and are subjected to a perpendicular magnetic field. The results for the dipole-allowed absorption spectrum show good qualitative agreement with the observed magnetoplasmon dispersion in similar systems. This work provides a unified description of the electron correlations in quantum dots and quantum rings in a magnetic field. We also demonstrate that optical absorption is a direct route to explore the effects of impurity and interactions in a quantum ring.
PACS: 73.20.Dx – Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) / 71.45.Gm – Exchange, correlation, dielectric and magnetic functions, plasmons / 73.20.Mf – Collective excitations (including plasmons and other charge-density excitations)
© EDP Sciences, 1996