English, Article edition: DISPERSION OF INTERFACE OPTICAL PHONONS AND THEIR COUPLING WITH ELECTRONS IN ASYMMETRICAL WURTZITE GaN/Ga1-xAlxN QUANTUM WELLS LI ZHANG; SONG GAO; JUN-JIE SHI

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Bookmark: http://trove.nla.gov.au/version/85037
Physical Description
  • article
Language
  • English

Edition details

Title
  • DISPERSION OF INTERFACE OPTICAL PHONONS AND THEIR COUPLING WITH ELECTRONS IN ASYMMETRICAL WURTZITE GaN/​Ga1-xAlxN QUANTUM WELLS
Author
  • LI ZHANG
  • SONG GAO
  • JUN-JIE SHI
Physical Description
  • article
Notes
  • Within the framework of the dielectric continuum model and Loudon's uniaxial crystal model, the properties of frequency dispersion of the interface optical (IO) phonon modes and the coupling functions of electronâIO-phonon interaction in an asymmetrical wurtzite quantum well (QW) are deduced and analyzed via the method of electrostatic potential expansion. Numerical results reveal that in general, there are four branches of IO phonon modes in the systems. The dispersions of the four branches of IO phonon modes are obvious only when the free wavenumber kt in xy plane is small. The degenerating behavior of all the four branches of IO phonon modes in the asymmetric wurtzite QWs has been clearly observed for small kt. When kt is relatively large, with the increase of kt, the frequencies of the IO phonon modes converge to the four definite limiting frequencies in the corresponding wurtzite single planar heterostructure. This feature is obviously different from that in symmetric wurtzite QW, and the mathematical and physical reasons have been analyzed in depth. The calculations of electronâphonon coupling function show that the electrostatic distribution of the IO modes is neither symmetrical nor antisymmetrical, and the high-frequency IO phonon branches and the short-wavelength IO phonon modes play a more important role in the electronâphonon interaction.
  • Phonon modes, electronâphonon coupling, asymmetrical wurtzite heterostructure, 63.20.Dj, 74.25.Kc, 71.38.-k, 63.20.Kr
  • RePEc:wsi:srlxxx:v:12:y:2005:i:03:p:433-442
Language
  • English
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