Optimization of slow light under EIT in semiconductor multiple quantum wells

We investigate the optimization of the group velocity of a weak probe field within electromagnetically induced transparency (EIT) windows created by two strong control fields, in an asymmetric four-level semiconductor multiple quantum well nanostructure. We observe that the first control field establishes the EIT window, while the second control field splits it into two segments. Additionally, we showcase the capability to toggle the dispersion from normal to anomalous and vice versa by tuning the control field parameters. The Rabi frequencies as well as detunings of the control fields also shift both the EIT windows and dispersion to the desired probe frequency ranges. By modifying the Rabi frequencies and detunings, we have the capability to effectively slow down the group velocity of the probe field by a thousandfold as compared to the speed of light in vacuum. These findings deepen our comprehension of EIT phenomena and present innovative possibilities for crafting photonic devices with tailored optical characteristics.