静压下ZnCdSe/ZnSe量子阱中的激子跃迁

Excitonic Transition in ZnCdSe/ZnSe Quantum Wells Under Hydrostatic Pressure

摘要:

利用变分法理论研究了ZnCdSeZnSe量子阱(QWs)中基态重空穴激子光跃迁能量随静压的变化关系。计入了有限高势垒效应。考虑了晶格常数、有效质量、介电常数及体弹性模量等参量的压力效应特别是体弹性模量的压力导数对跃迁能量随压力变化的函数关系的影响。结果表明，体弹性模量的压力导数对跃迁能量随压力变化的函数关系影响很大。根据计算结果．估算出ZnCdSe／ZnSe QWs中Zn0.82Cd0.1:Se的体积弹性模量之压力导数近似为1．0。

Abstract:

A theoretical calculation for the transition energies of the ground state heavy hole excitons in ZnSe/ZnCdSe quantum wells(QWs) under hydrostatic pressure was performed using a variational technique.The finite barrier effect was included.The dependence of pressure on the parameters such as lattice constant,effective masses,dielectric constant and bulk modulus were discussed.It is shown that the pressure of bulk modulus plays an important role in determining the functional relation between the transitiion energy and pressure.Based on the calculation,it is estimated for the first time that the pressure derivative of the bulk modulus of Zn_(0.82)Cd_(0.17)Se is near unity.