ABSTRACT

The temperature, hydrostatic pressure, and external electric field effects on the confined exciton in cylindrical quantum dots by considering a parabolic confining potential are investigated. The effects of these external perturbations on the binding energy and interband emission energy are calculated numerically by adopting the variational method within the effective mass approximation. Our findings indicate that the exciton binding energy and interband emission energy depend significantly on decreasing electric field, diminishing temperature, and enhancing the hydrostatic pressure. The contribution of the electric field on the binding energy becomes more important for wide axial parabolic quantum well. We have also shown that the Stark effect of exciton diminishes almost linearly with increasing hydrostatic pressure. Furthermore, the electric field and the quantum dot height lead to enhancing the Stark shift. The behaviour of the excitonic Stark shift as a function of the applied electric field proves the existence of a dipole moment. This physical parameter becomes important for the weak confinement regime.

抽象的

通过考虑抛物线约束电位，研究了温度，流体静压力和外部电场对圆柱量子点中的约束激子的影响。通过在有效质量近似内采用变分方法，数值计算了这些外部扰动对结合能和带间发射能的影响。我们的发现表明，激子结合能和带间发射能明显取决于减小电场，降低温度和增加静水压力。对于宽轴向抛物线量子阱，电场对结合能的贡献变得更加重要。我们还表明，激子的斯塔克效应随静水压力的增加而线性减小。此外，电场和量子点高度导致Star​​k位移增强。激子斯塔克频移作为所施加电场的函数的行为证明了偶极矩的存在。该物理参数对于弱约束机制很重要。