Programme

P.18 -- Poster, VCTP-48

Date: Tuesday, 1 August 2023

Time: 08:30 - 10:00

Quantum beat oscillations of excitons confined in spherical sector quantum dots

Le Thi Dieu Hien (1,2), Le Thi Ngoc Bao (2), Duong Dinh Phuoc (3), Dinh Nhu Thao (1)

(1) University of Education, Hue University, 34 Le Loi Street, Hue City, Vietnam (2) University of Sciences, Hue University, 77 Nguyen Hue Street, Hue City, Vietnam (3) Hai Ba Trung High School, 14 Le Loi Street, Hue City, Vietnam

In this work, we study the exciton quantum beats in spherical sector quantum dots in a three-level model by the renormalized wavefunction method. The wavefunction expression of the exciton in the non-stationary state and the time-dependent absorption intensity of the exciton under the effect of an intensive pump laser resonating with two exciton levels are also provided. The numerical results show that the exciton absorption intensity takes the form of a damped periodic oscillation in the presence of the pump laser. This is the obvious evidence of the exciton quantum beat behavior that has appeared in the quantum dots. In addition, the amplitude and frequency of the beat depend substantially on the geometric parameters, the quantum dot shape, and the pump laser detuning.

Presenter: Le Thi Dieu Hien