Program

P.58 -- Poster, NCTP-42

Date: Wednesday, 2 August 2017

Time: 08h30 - 10h00

Cyclotron resonance linewidth in quantum wells with different phonon models

Nguyen Dinh Hien (1), Le Dinh (1), Vo Thanh Lam (2), Tran Cong Phong (3)

(1) Center for Theoretical & Computational Physics, Hue University’s College of Education, 34 Le Loi Street, Hue City, Viet Nam; (2) Sai Gon University, 273 An Duong Vuong Street, Ho Chi Minh City, Viet Nam; (3) Vietnam Institute of Educational Sciences,101 Tran Hung Dao Street, Ha Noi City, Viet Nam.

The influence of different phonon models on the cyclotron resonance (CR) effect and CR linewidth (CRLW) via photon absorption processes in a square quantum well by using the operator projection is theoretically studied. We consider the cases when electrons are scattered by bulk phonons and confined optical phonons described by the Fuchs-Kliewer slab, Ridley's guided, and Huang-Zhu models. The numerical result for a specific quantum well shows that the CRLW increases with temperature, magnetic field and decreases with well's width for all the phonon models. It is also seen that CRLW in the cases of confined phonons described by all three models (HZ, slab mode, and guided mode) varies faster and has a larger value than it does for the bulk phonons case. Besides, the CRLW is found largest for HZ model among the three confined phonons models, while it is smallest for guided mode model case. This renders that the electron-confined phonon scattering is strongest for HZ model and weakest for guided mode model. Furthermore, in the small range of the well's width, the influence of phonon confinement plays an important role and cannot be neglected in considering CRLW. The present results are in qualitative agreement with the existing theoretical and experimental results.

Presenter: Nguyen Dinh Hien