Electromagnetically induced transparency in a spherical quantum dot with hydrogenic impurity in a four level ladder configuration

The present paper analyses the electromagnetically induced transparency (EIT) in the spherical quantum dot with on-center hydrogenic impurity in a four level ladder configuration. The four level ladder configuration is realized by four energy levels of hydrogen impurity: 1S0, 2p−12p−1, 3d−23d−2, and 4f−34f−3, together with the probe and two control laser fields which induce σ−σ− transitions between the given states. Absorption of the probe field as a function of the spherical quantum dot radius and detuning of the probe field is discussed, and comparison of this configuration to the three level ladder configuration is given. Finally, the additional absorption peak that appears in the four level configuration is discussed in detail.