Dispersions of quasi-confined optical phonon modes and their electron–phonon interactions in an asymmetric wurtzite AlxGa1?xN / GaN / Aly Ga1?yN quantum well |
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| Institution: | 1. Ural Federal University, Lenina Ave 51, 620000, Ekaterinburg, Russia;2. Menoufiya University, 32511, Shebin El-Koom, Egypt;1. Department of Electronic Science, University of Delhi South Campus, New Delhi 110021, India;2. Materials Science Group, Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India;1. Department of Physics, Wenzhou University, Wenzhou 325035, P.R. China;2. Department of Computer Science, Wenzhou University, Wenzhou 325035, P.R. China;1. Electronic Materials Research Center, Korea Institute of Science and Technology, 14 gil 5, Hwarang-ro, Seongbuk-gu, Seoul 136-791, Republic of Korea;2. Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology, 14 gil 5, Hwarang-ro, Seongbuk-gu, Seoul 136-791, Republic of Korea;1. State Key Laboratory of Software Development Environment, School of Computer Science & Engineering, Beihang University, Beijing, 100191, PR China;2. School of Computer Science & Engineering, Beihang University, Beijing, 100191, PR China |
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| Abstract: | Within the framework of the dielectric continuum model and Loudon’s uniaxial crystal model, the properties of the quasi-confined (QC) optical phonon dispersions and the electron–QC phonons coupling functions in an asymmetric wurtzite quantum well (QW) are deduced via the method of electrostatic potential expanding. The present theoretical scheme can be treated as a generalization of the QC optical phonons in an ordinary wurtzite double heterostructures QWs, and it can be reduced naturally to the situation of the symmetrical wurtzite QW once a suite of symmetrical parameters are adopted. Numerical computation on an asymmetric AlN/ GaN/ Al0.15Ga0.85N wurtzite QW are performed, and a detailed comparison with the case in symmetric wurtzite QW is carried out. The calculated results show that the structural asymmetry of wurtzite QW changes greatly the dispersion behaviors and the electrostatic potential distributions of the QC optical phonon modes. |
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