中国物理B ›› 2007, Vol. 16 ›› Issue (9): 2537-2543.doi: 10.1088/1009-1963/16/9/007

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Exciton--polaritons in ternary mixed crystals

刘丽, 梁希侠, 包锦   

  1. Department of Physics, Inner Mongolia University, Hohhot 010021, China
  • 收稿日期:2006-10-08 修回日期:2007-01-30 出版日期:2007-09-20 发布日期:2007-09-20
  • 基金资助:
    Project supported partly by PhD Progress Foundation of Higher Education Institutions of China (Grant No~20040126003) and the Natural Science Foundation of Inner Mongol of China (Grant No~200408020101).

Exciton--polaritons in ternary mixed crystals

Liu Li(刘丽), Liang Xi-Xia(梁希侠)† , and Bao Jin(包锦）   

  1. Department of Physics, Inner Mongolia University, Hohhot 010021, China
  • Received:2006-10-08 Revised:2007-01-30 Online:2007-09-20 Published:2007-09-20
  • Supported by:
    Project supported partly by PhD Progress Foundation of Higher Education Institutions of China (Grant No~20040126003) and the Natural Science Foundation of Inner Mongol of China (Grant No~200408020101).

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摘要： In this paper the bulk exciton polaritons in ternary mixed crystals (TMCs) are investigated in the Born--Huang approximation. The numerical results of the polariton frequencies as functions of the wave-vector and the compositions for ternary mixed crystals Al$_{x$Ga$_{1 - x$As, Cd$_{x$Zn$_{1 - x$Se, and Al$_{x$Ga$_{1 - x$N are obtained and discussed. The new dispersion characteristics for exciton--polaritons in TMC systems are found in comparison with binary crystals. The splitting of the two branches of exciton--polariton frequencies varies nonlinearly with the composition of TMCs and has a minimum in the long-wavelength range.

关键词: polariton, exciton, ternary mixed crystal

Abstract: In this paper the bulk exciton polaritons in ternary mixed crystals (TMCs) are investigated in the Born--Huang approximation. The numerical results of the polariton frequencies as functions of the wave-vector and the compositions for ternary mixed crystals Al$_x$Ga$_{1 - x}$As, Cd$_x$Zn$_{1 - x}$Se, and Al$_x$Ga$_{1 - x}$N are obtained and discussed. The new dispersion characteristics for exciton--polaritons in TMC systems are found in comparison with binary crystals. The splitting of the two branches of exciton--polariton frequencies varies nonlinearly with the composition of TMCs and has a minimum in the long-wavelength range.

Key words: polariton, exciton, ternary mixed crystal

中图分类号:  (Polaritons (including photon-phonon and photon-magnon interactions))

  • 71.36.+c
71.35.-y (Excitons and related phenomena)