Parameter-dependent optical nutation in PbSe/CdSe/ZnS quantum-dot

摘要

The eigenenergies and eigenfunctions of the spherical PbSe/CdSe/ZnS quantum-dot with the core-shell-shell structure and the electric dipole moment between the a _1s state (the lowest state of the system) and b _1p state (the lowest p state above the first potential) have been calculated by using the rotational wave approximation and the effective mass approximation. The optical nutation signal induced by the transition between these two energy levels has been calculated based on the optical Bloch equations. In particular, the influence of the core’s radius increasing and the CdSe shell’s thickness increasing has been investigated respectively. It is shown from the numerical calculation results that the optical nutation signals are dependent on the size and the structure of the quantum-dot. Moreover, the quantum size-dependent Rabi frequency has been analyzed.