Effects of electric field and light polarization on the electromagnetically induced transparency in an impurity doped quantum ring

• Published in: Optical materials 2018-01, Vol.75, p.827-840
• Main Authors: Bejan, D., Stan, C., Niculescu, E.C.
• Format: Article
• Language: English
• Subjects: Donor impurity; Electric field; Electromagnetically induced transparency; Polarization; Quantum ring; Susceptibility
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2017.11.047

We theoretically investigated the effects of the impurity position, in-plane electric field, intensity and polarization of the probe and control lasers on the electromagnetically induced transparency (EIT) in GaAs/GaAlAs disc shaped quantum ring. Our study reveals that, depending on the impurity position, the quantum system presents two specific configurations for the EIT occurrence even in the absence of the external electric field, i.e. ladder-configuration or V-configuration, and changes the configuration from ladder to V for specific electric field values. The polarization of the probe and control lasers plays a crucial role in obtaining a good transparency. The electric field controls the red-shift (blue-shift) of the transparency window and modifies its width. The system exhibits birefringence for the probe light in a limited interval of electric field values. •Electromagnetically induced transparency in a quantum ring under electric field is studied.•The quantum ring presents ladder and V configurations that interchange at specific field values.•The polarization of probe and control lasers plays a crucial role in obtaining a good transparency.•Electric field controls the red-shift (blue-shift) of transparency window and modifies its width.•The system may exhibit birefringence for probe light in limited interval of electric field values.