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Acta Phys. Sin. (Overseas Edition), 1996, Vol. 5(6): 438-449    DOI: 10.1088/1004-423X/5/6/005
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

OPTICAL-PHONON MODES AND ELECTRON-OPTICAL-PHONON INTERACTION IN A COUPLED QUANTUM WELL

SHI JUN-JIE
China Center of Advanced Science and Technology (CCAST) (World Laboratory), Beijing 100080, China; Department of Physics, Henan Normal University, Xinxiang 453002, China
Abstract  By applying the dielectric continuum model, optical-phonon modes of the lattice vibration and a complete interaction Frohlich-like Harniltonian between an electron and the optical phonons including the interface phonons, the confined LO phonons and the half-space LO phonons are derived for a general coupled quantum well (GCQW) structure of polar crystals. The dispersion curves of the interface modes and the electron-interface-phonon coupling function as functions of coordinate z and wavenumber k are given and discussed for a GCQW. We find that there are eight (not ten) frequency solutions for the interface optical-phonon modes in GCQW and that, in the long-wavelength limit, the longitudinal and transverse modes in the two side materials 1 and 5 are forbidden and two new frequency solutions ω± are obtained instead. Moreover, we also find that the electron-interface-phonon coupling functions are complicated functions of k and that the phonons with long wavelengths are important and the higher-frequency modes are more important than the lower-frequency modes for the electron-phonon interaction.
Received:  12 July 1995      Revised:  09 October 1995      Published:  20 June 1996
PACS:  63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)  
  68.35.Ja (Surface and interface dynamics and vibrations)  
  73.40.Kp (III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)  
  78.67.De (Quantum wells)  
Fund: Project supported by the National Natural Science Foundation of China and by the Provincial Natural Science Foundation of Henan, China.

Cite this article: 

SHI JUN-JIE OPTICAL-PHONON MODES AND ELECTRON-OPTICAL-PHONON INTERACTION IN A COUPLED QUANTUM WELL 1996 Acta Phys. Sin. (Overseas Edition) 5 438

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