<I>C</I>–<I>V</I> Data and Geometry Parameters of Self-Assembled InAs/GaAs Quantum Rings

Abstract

The electron properties of InAs/GaAs quantum rings (QR) in a magnetic field are studied. We applied the original effective model which is based on a single band kp-approximation with energy dependence of effective mass. We used two sets of the geometry parameters for the selfassembled QR. The first is the experimentally proposed geometry; the second follows from the oscillator model, due to the relation between the parameters of the model and the real sizes of the quantum objects. The energy of an electron in a magnetic field, calculated with both geometries, is compared with the C-V experimental data. We show that the results of the calculation with the second geometry fit the experimental data rather well. Interpretation of the recent C-V data given by Lei et al. (Appl. Phys. Lett. 96, 033111 (2010)) on the basis of the oscillator model is discussed.

Quantum Dots and Quantum Rings: Real Low Dimensional Systems

“…10. 39 The picture of the change of the orbital quantum number of the ground state is similar to that obtained in 31 with the oscillator model. The change occurred at 2.2 T and 6.7 T. The obtained energy fits the experimental data rather well.…”