Programme

P.45 -- Poster, VCTP-46

Date: Wednesday, 6 October 2021

Time: 08:30 - 10:00

Cylindrical quantum wire : the Quantum photo-stimulated Peltier effect under the influence of confined acoustic phonons.

Hoang Van Ngoc (1), Nguyen Thị Nguyet Anh (2*), Tang Thi Dien (2 ), Do Tuan Long (2) , Nguyen Quang Bau (2)

(1 ) Institute of Applied Technology, Thu Dau Mot University, N0 06 Tran Van On, Thu Dau Mot, Binh Duong, Vietnam. (2 ) Department of Theoretical Physics, Faculty of Physics, VNU University of Science, N0 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam.

The Quantum photo-stimulated Peltier effect has been theoretically studied under the influence of confined acoustic phonon in a cylindrical quantum wire with an infinite potential by using the quantum kinetic equation method. In this work, we assume that the electron-confined acoustic phonon scattering is essential. Moreover, the presence of a strong electromagnetic wave (EMW) is also taken into account to determine the influence of confined phonons on the aforementioned effects. We have defined the analytical expressions for the kinetic tensors and the Peltier coefficients (PC). In detailed consideration, the quantum number m was changed in order to characterize the influence of confined acoustic phonon. When setting m to zero, we obtained the results that corresponded to the case of an unconfined phonon. The theoretical results have been numerically evaluated and discussed for the GaAs/GaAsAl quantum wire (CQW). The change of PC in two cases unconfined acoustic phonon and confined acoustic phonon have been found according to augment of EMW frequency. The value of resonant peaks has altered under the influence of phonon confinement. The difference of PC also has been discovered when investigating its dependence on the cyclotron frequency. Furthermore, the PC reduced suddenly when considering the dependence of PC on the radius of wire and PC on the low temperature. All numerical showed that the magnitude of PC diverse significantly in comparison with unconfined case and doped two – dimensional semiconductor superlattice. This means that the confinement of the phonon affects the Peltier effect quantitatively and qualitatively. These results are new and provide to completing the theory of the Peltier effect in low- dimensional semiconductor systems.

Presenter: Nguyễn Thị Nguyệt Ánh