Programme

P.5 -- Poster, VCTP-47

Date: Tuesday, 2 August 2022

Time: 08:30 - 10:00

Effect of confined optical phonons on photo-stimulated Ettingshausen effect in rectangular quantum wires with a perpendicular field.

Nguyen Thi Nguyet Anh (1), Cao Vi Ba (2*), Tang Thi Dien (2), Nguyen Quang Bau (2)

(1,2) Department of Theoretical Physics, Faculty of Physics, VNU University of Science, No. 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam.

We apply the quantum kinetic equation method to investigate the influence of confined optical phonons (confined OP) on the photo-stimulated Ettingshausen effect in rectangular quantum wires ( RQW ) subjected to a perpendicular magnetic field. We considered the case where the confined electrons-confined OP scattering is the dominant mechanism. Analytical expressions for the kinetic tensors, the Ettingshausen and the temperature difference (∆Ty ) are obtained. The Ettingshausen confined (EC) is a function of external fields, the temperature of the system, especially the quantum numbers m1 and m2 characterizing confined OP. The numerical results are numerically evaluated and discussed for the GaAs/AlGaAs RQW .The magnitude of the resonance peaks in the case confined OP has been risen about 3,6 times compared to the case unconfined OP, found when examining the dependence of the EC on the magnetic field. Besides, the dependence of the temperature difference ( ∆Ty ) on the cyclotron energy was also found. It is shown that ∆Ty has been changed by about 45K. These results were indicated that the EC and the temperature difference ∆Ty were influenced by the confinement optical phonons. These results are important for further researches and can be helped to complete the theory of the thermo-magnetoelectric effects in low dimensional system. Keywords: Confined optical phonon, the quantum Ettingshausen effect, rectangular quantum wires, quantum kinetic equation, photo-stimulated effect.

Presenter: Cao Thị Vi Ba