Programme

P.41 -- Poster, VCTP-49

Date: Friday, 2 August 2024

Time: 08:30 - 10:00

Nonlinear multi-photon Absorption of a Strong Electromagnetic Wave with electron-acoustic phonon scattering in infinite semi-parabolic Plus semi-inverse Squared Quantum Wells .

Nguyen Thu Huong (1), Bui Thi Dung (2*), Nguyen Cong Huy (2), Nguyen Quang Son (1), Nguyen Quang Bau (2)

(1) Academy of Air Defense and Air Force, Kim Son, Son Tay, Ha Noi, Viet Nam. (2) Department of Theoretical Physics, Faculty of Physics, VNU University of Science. 334 Nguyen Trai, Thanh Xuan, Ha Noi, Viet Nam.

Theoretical study of the nonlinear multi-photon absorption of a strong electromagnetic wave in infinite semi-parabolic plus semi-inverse Squared Quantum Wells (ISPPSISQW) by using quantum kinetic equations for the case of electron-acoustic phonon scattering. Analytical expressions for the nonlinear multi-photon absorption coefficient in the ISPPSISQW are obtained for a specific GaAs/GaAsAl in the case of the absence and the case of the presence of an external magnetic field B. A second-order multi-photon process is included in the result. The dependence of the nonlinear multi-photon absorption coefficient on the intensity {E_0} and the frequency Ω of a strong electromagnetic wave, confinement frequency of ISPPSISQW {\omega_z} and the temperature T is investigated. The numerical computations for a specific ISPPSISQW GaAs/GaAsAl show that the nonlinear multi-photon absorption coefficient decreases rapidly with increasing {\omega_z} or Ω and the nonlinear multi-photon absorption coefficient increases rapidly with {E_0} or T. In the case of the presence of an external magnetic field B, the Shbnikov- de Hass (SdH) oscillations have appeared in the dependence of the nonlinear multi-photon absorption coefficient on the magnetic field B. The amplitude of the SdH oscillations in the absorption coefficient decreases as the system's temperature T increases, and the amplitude of the SdH oscillations in the absorption coefficient will increase as the frequency Ω increases.

Presenter: Dung Thi Bui