Zn_(1-x)Cd_xSe/ZnSe量子阱重空穴激子的跃迁能量和压力系数

Transition Energies and Pressure Coefficients of the Heavy-hole Excitons in a ZnCdSe/ZnSe Quantum well

考虑压力下势垒高度、激子结合能的改变等诸多因素的影响后数值研究了Ⅱ -Ⅵ族ZnCdSe/ZnSe量子阱重空穴激子的跃迁能量和压力系数 ,特别是压力系数随阱宽的变化规律。计算表明在SCPA近似下跃迁能量的计算与实验值吻合较好 ,而在压力系数的计算中必须计及材料的体积弹性模量随温度和压力的变化。证实了ZnCdSe/ZnSe量子阱重空穴激子的压力系数随阱宽增大而减小的结论。

The transition energies and the pressure coefficients of the heavy-hole excitons in a ZnCdSe/ZnSe strained quantum well are studied numerically with consideration of the changes of the barrier heights, the exciton binding energies and other factors. It is shown that the transition energies are well agreed with the available experimental data in the SCPA approximation and the variations of the bulk modulus versus temperature and pressure must be considered in the calculation of pressure coefficients. The pressure coefficients of the heavy-hole excitons are found to decrease with increasing well width, which is in agreement with the experimental result.