Resonance states in a cylindrical quantum dot with an external magnetic field

Abstract

Bound and resonance states of quantum dots play a significant role in photo-absorption processes. In this work, we analyse a cylindrical quantum dot, its spectrum and, in particular, the behaviour of the lowest resonance state when a magnetic field is applied along the symmetry axis of the cylinder. To obtain the energy and width of the resonance we use the complex rotation method. As expected, the structure of the spectrum is strongly influenced by the Landau levels associated to the magnetic field. We show how this structure affects the behaviour of the resonance state and that the binding of the resonance has a clear interpretation in terms of the Landau levels and the probability of localization of the resonance state. The localization probability and the fidelity of the lowest energy state allow identification of two different physical regimes, a large field–small quantum dot radius regime and a small field–large quantum dot radius, where the binding of the resonance is dominated by the field strength or the potential well, respectively.