Nonlinear optical properties of an off-center donor in a quantum dot under applied magnetic field

The nonlinear optical properties of an off-center hydrogenic donor in a two-dimensional quantum dot under applied magnetic field are investigated in detail by using the matrix diagonalization method. Based on the computed energies and wave functions, the linear, third-order and total optical absorption coefficients as well as the refractive index changes have been examined between the ground state (L=0)(L=0) and the first excited state (L=1)(L=1). The results show that the ion position, the applied magnetic field, the confinement frequency, and the incident optical intensity have an important influence on the nonlinear optical properties of off-center donors.

Research highlights
► We propose a procedure to study an off-center donor in quantum dots under applied magnetic field.
► The nonlinear optical properties of a donor are strongly affected by the ion position.
► The magnetic field has an important influence on the nonlinear optical properties of a donor.