DISPERSIONS AND FRÖHLICH ELECTRON–PHONON INTERACTION HAMILTONIAN OF PROPAGATING OPTICAL PHONON MODES IN QUASI-ONE-DIMENSIONAL WURTZITEGaN-BASED QUANTUM WELL WIRES

L. Zhang () and Hong-Jing Xie
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L. Zhang: Department of Mechanism and Electronics, Panyu Polytechnic, Panyu 511483, P. R. China
Hong-Jing Xie: School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, P. R. China

Surface Review and Letters (SRL), 2007, vol. 14, issue 05, 903-910

Abstract: Based on the dielectric continuum model and Loudon's uniaxial crystal model, the propagating (PR) optical phonon modes and the Fröhlich-like electron–PR phonon interaction Hamiltonian in a quasi-one-dimensional (Q1D) wurtzite quantum well wire (QWW) structure are deduced and analyzed. Numerical calculations onAlGaN/GaN/AlGaNwurtzite QWW are performed. Results reveal that the dispersive frequencies of PR modes are the continuous functions of free wavenumberkzinz-direction and discrete functions of azimuthal quantum numberm. The reduced behavior of the PR modes in wurtzite quantum systems is obviously observed. From the discussion of the electron–PR phonon coupling functions, it is found that the low-order PR modes in the case of smallkzandmplay a more important role in the electron–PR phonon interactions. Moreover, a detailed comparison of the PR modes in Q1D QWW structures with those in quasi-two-dimensional quantum wells are also carried out. The physical reasons resulting in the relationship and distinction in the two types of systems are also analyzed deeply.

Keywords: 78.67.Lt; 63.20.Dj; 81.05.Ea (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07010421

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