Quantum rings under magnetic fields: Electronic and optical properties

Abstract

Electronic and optical characteristic energies of semiconductor quantum rings in the presence of magnetic fields were determined by adopting distinct potential models to describe the ring confinement and considering different geometric confinement parameters defining the quantum ring. It was found that the ground-state energy becomes independent of the ring radius once the internal ring hole is present, because it is the strength of the lateral confinement that determines its subsequent behavior. The optical spectra for large and narrow quantum rings exhibit a set of resonances governed basically by the strength of the radial confinement. The presence of a magnetic field produces a notable enhancement of the resonance intensities.