Study of electron-related intersubband optical properties in three coupled quantum wells wires with triangular transversal section

•Confined electrons in coupled triangular quantum wires.•Calculations are in the effective mass and parabolic band approximations.•Diagonalization method to find the eigenfunctions and eigenvalues.•Comparative analysis of absorption and refractive index change.

This work concerns theoretical study of confined electrons in a low-dimensional structure consisting of three coupled triangular GaAs/AlxGa1−xAs quantum wires. Calculations have been made in the effective mass and parabolic band approximations. In the calculations a diagonalization method to find the eigenfunctions and eigenvalues of the Hamiltonian was used. A comparative analysis of linear and nonlinear optical absorption coefficients and the relative change in the refractive index was made, which is tied to the intersubband electron transitions.