Photoionization cross section in a two-dimensional quantum ring with a donor impurity

• The transition energy, wave function and PCS in a Winternitz–Smorodinsky potential QR have been investigated.
• An increase of B causes the wave functions to be confined in a smaller space.
• The PCS of this system increases with an increasing B.
• The ring width has an important effect on the PCS.
• The Aharonov–Bohm oscillation will be found even in a finite ring width in this system.

The transition energy, wave function and photoionization cross-section (PCS) in a Winternitz–Smorodinsky potential quantum ring (QR) with a donor impurity subjected to a uniform magnetic field along the z-axis have been investigated within the compact-density matrix approach. The dependence of these optical properties on the inner radius R1, the outer radius R2, and the magnetic field B is studied in detail. The results reveal that the transition energy, wave function and the PCS in a Winternitz–Smorodinsky potential QR have been strongly affected by these factors. In addition, it can be found that the resonant peak of the PCS presents the Aharonov–Bohm oscillation by changing the magnetic flux.