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.
Received: 08 October 2006
Revised: 30 January 2007
Accepted manuscript online:
PACS:
71.36.+c
(Polaritons (including photon-phonon and photon-magnon interactions))
Fund: 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).
Cite this article:
Liu Li(刘丽), Liang Xi-Xia(梁希侠), and Bao Jin(包锦） Exciton--polaritons in ternary mixed crystals 2007 Chinese Physics 16 2537
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