Optical nutation induced by transition between levels inside and outside the well in a core-shell CdSe/ZnS quantum dot

The energy eigenvalues and eigenfunctions of a core-shell CdSe/ZnS quantum dot structure have been obtained under an effective-mass approximation. The electric transition dipole moment induced by the 1s (inside the well)-1s (outside the well) transition has been calculated. The optical nutation signal induced by the transition has been calculated numerically based on the optical Bloch equations. In particular, the influence of the size variation of the core's radius and the shell's thickness has been studied. It has been shown from the results that the optical nutation signal is sensitive to the size and structure, and that there is an optimal structure and size for the optical nutation phenomenon. The quantum size dependent Rabi frequency and intensity of the optical nutation are also discussed