Binding energy of hydrogen-like donor impurity and photoionization cross-section in InAs Pöschl–Teller quantum ring under applied magnetic field

Using the variational method and the effective mass approximation, we have studied the binding energy and the photoionization cross-section of a donor impurity in InAs Pöschl–Teller quantum rings under applied magnetic fields. This work reports the binding energy and the photoionization cross-section dependencies on the geometry of the structure, impurity positions, asymmetry of the confining potential, magnetic field, and incident photon energy. The results show that the binding energy behaves as a decreasing function of the height, outer radius, confining potential, and magnetic field. Because of the decrease (increasing) of the impurity binding energy there is a redshift (blueshift) of the photoionization cross-section in the system.

► Binding energy of donor impurity in Pöschl–Teller quantum ring.
► Photoionization cross-section of donor impurity in Pöschl–Teller quantum ring.
► The binding energy is a decreasing function of the geometry.
► The binding energy is a decreasing function of the magnetic field.
► The photoionization cross-section can be redshifted and/or blueshifted.