Optical nutation in multilayered ellipsoidal quantum dots

• A suitable change of variable transforms the ellipsoidal quantum dots into the spherical QDs.
• The energy levels and wave functions of two and three EQD are calculated.
• The electric transition dipole moment for two levels system in multilayered EQDs is calculated.
• The optical Bloch equation is used to solve the Liouville equation of density matrix.
• The optical nutation signal for multilayered ellipsoidal quantum dots is investigated.

The optical nutation signal of two and three ellipsoidal quantum dots (EQD) with finite confinement potential in the presence of polarized laser field is considered. In this regard, the effective-mass approximation within a perturbation scheme is used and the induced effective polarization of atoms in the multilayered ellipsoidal quantum dots is calculated for GaAs/GaAlAs/GaAs structure. The results showed that the optical nutation peak depends not only on the thickness of the intermediate layer but also on the ellipticity constant.

The variations of optical nutation signal versus time for core/shell/shell ellipsoidal quantum dot and different values of β.Figure optionsDownload as PowerPoint slide