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Nonlinear absorption power and linewidths in quantum well with triangular potential

The analytic expression for absorption power of a strong electromagnetic waves caused by confined electrons in quantum well is obtained in the case of electron-optical phonon scattering. Nonlinear optically detected electrophonon resonance (ODEPR) effect in a specific GaAs/AlAs quantum well with triangular potential is investigated. | NONLINEAR ABSORPTION POWER AND LINEWIDTHS IN QUANTUM WELL WITH TRIANGULAR POTENTIAL LE DINH Department of Physics, University of Education, Hue University VO THANH LAM Saigon University NGUYEN HOANG VU University of Education, Hue University Abstract: The analytic expression for absorption power of a strong electromagnetic waves caused by confined electrons in quantum well is obtained in the case of electron-optical phonon scattering. Nonlinear optically detected electrophonon resonance (ODEPR) effect in a specific GaAs/AlAs quantum well with triangular potential is investigated. Conditions for ODEPR are discussed based on the curves expressing the dependence of absorption power on the photon energy. From these curves we obtained ODEPR- linewidths as profiles of the curves. Computational results show that the nonlinear ODEPR- linewidths increase with temperature and decrease with electric field amplitude. Keywords: absorption power, quantum well, triangular potential, ODEPRlinewidths 1 INTRODUCTION Optically detected electrophonon resonance linewidths are the good tools for investigating scattering mechanisms of carriers and hence can be used to probe electron-phonon scattering mechanisms. Most of the works on linewidths have focused on the transport properties of low dimensional semiconductors. Unuma et al. [1] investigated the intersubband absorption linewidths in GaAs quantum well for various kinds of scattering mechanisms. The obtained results of this work showed that the linewidths decrease with well width. Kang and coworks [2, 3, 4, 5] used the operator projection technique to study intraband linewidths of the optical conductivity in quantum wells due to LO-phonon scattering. Their works indicated that the linewidths increase with the temperature and decrease with the well widths. Li and Ning [6] investigated the influence of electron-electron and electron-phonon scattering on the linewidths in quantum wells. Their results were in line with experimental .