Programme

P.20 -- Poster, VCTP-48

Date: Tuesday, 1 August 2023

Time: 08:30 - 10:00

Photostimulated Nernst effect in compositional superlattice under the influence of confined phonon

Nguyen Thu Huong (1́), Tang Thi Dien (2,*), Nguyen Quang Bau (2,*),Tran Khuong Duy (2), Nguyen Dinh Nam (2), Dao Thanh Hue (2)

(1́) Academy of Air Defense and Air Force, Kim Son, Son Tay, Hanoi, Vietnam (2) Department of Theoretical Physics, Faculty of Physics, VNU University of Science, Vietnam National University, Hanoi, Vietnam

The photostimulated Nernst effect in compositional superlattice under the influence of confined phonon in two cases electron – acoustic phonon scattering and electron–optical phonon scattering is obtained by using the quantum kinetic equation. The results indicate that the Shubinikov-Dehass oscillations have appeared when examining the effect of magnetic field on the Nernst coefficient (NC) in electron–acoustic phonon scattering. The confined phonons not only make the magnitude of the Nernst coefficient smaller but also more obvious than the case of unconfined phonons. In addition, for the electron–optical phonon scattering, the magneto-photon resonance condition is also proved, the position of resonance NC’s peaks is shifted by confined optical phonons. Besides, the Nernst coefficient is decreased significantly as the temperature increases. Our results in this study show that the Nernst effect in compositional superlattice is different from bulk semiconductors.

Presenter: Tang Thi Dien