Magnetocaloric effect, magnetic susceptibility and specific heat of tuned quantum dot/ring systems

Abstract

In this paper, we have considered a GaAs quantum dot/quantum ring with a parabolic-inverse square confinement potential in addition to modified Gaussian potential in the presence of a perpendicular magnetic field. The energy levels were first determined and then the behavior of specific heat, magnetic susceptibility and magnetic entropy change of the system were investigated. We have presented the effect of magnetic field and the system parameters on temperature dependence of specific heat and magnetic susceptibility over wide temperature ranges. It is found that the magnetic susceptibility shows both positive and negative values with using different parameters. Also, the temperature dependence of the magnetic entropy change ( Δ S ) (magnetocaloric effect) shows a pronounced minimum at low temperatures. • A GaAs quantum dot/quantum ring with a parabolic-inverse square confinement potential in the presence of a magnetic field. • Investigating the behavior of specific heat, magnetic susceptibility and magnetic entropy change. • The magnetic susceptibility shows both positive and negative values with using different parameters.