Programme

P.59 -- Poster, NCTP-43

Date: Wednesday, 1 August 2018

Time: 08:30 - 10:00

The effect of a strong laser electric field on the absorption spectrum of excitons in GaAs/AlGaAs quantum wires

Dương Đình Phước, Đinh Như Thảo

Khoa Vật lý, Trường Đại học Sư phạm - Đại học Huế, 34 Lê Lợi, Thành Phố Huế

In this work, we study the effect of a strong laser electric field on the absorption spectrum of excitons in GaAs/AlGaAs quantum wires. We apply therenormalization wavefunction theory to a three level model irradiated by a stronglaser wave resonant with two level of electrons. Results show that the exciton absorption spectrum is separated into two distinct absorption peaks due to the optical Stark effect. The appearance of those two peaks provides an evidence of the separation of the electron levels. In addition, when we change the size of the structure, the absorption spectrum of excitons shifts to a different energy band. This fact clearly reveals the quantum confinement effectsin the semiconductor quan-tum wires. Key words. Absorption spectrum, exciton, optical Stark effect, quantum wire, GaAs, Al-GaAs.

Presenter: Dương Đình Phước