Effect of interdiffusion on electronic states of strain-free Gaussian-shaped double quantum ring superlattice

• The effect of interdiffusion on electronic states in a quantum ring superlattice is studied.
• The Gaussian-Shaped double quantum rings have been considered.
• Both the cases of superlattice of cubic and tetragonal symmetry have been considered.
• The first two minibands shift to the region of higher energies due to interdiffusion.
• As a result of interdiffusion the minibands become wider.

The effect of interdiffusion on band structure and Bloch amplitudes of three dimensional superlattice composed of Gaussian shaped double quantum rings is investigated using the Fourier transformation to the momentum space. It is shown that the sequence of the principal quasimomentum vectors which correspond to the energy increase depends on superlattice symmetry. Due to interdiffusion both the first and the second minibands of conduction band shift to the region of higher energies and broaden, meanwhile the difference between the behaviors of the dispersion curves in different directions of momentum space gradually disappears. The obtained results indicate to the opportunity of purposeful manipulation of structure characteristics by means of interdiffusion both quantitively and qualitatively.