Stark Effect of Interactive Electron-hole pairs in Spherical Semiconductor QDs 2

Abstract. We present a theoretical approach, based on the effective mass approximation model, on the quantum-confinement Stark effects for spherical semiconducting quantum dots in the regime of strong confinement of interactive electron-hole pair and limiting weak electric field. The respective roles of Coulomb potential and polarization energy are investigated in details. Under reasonable physical assumptions, analytical calculations can be performed. They show that the Stark shift is a quadratic function of the electric field amplitude in this regime. The computed numerical values obtained from this approach are found to be in good agreement with experimental data over a significant domain of quantum dot sizes. PACS numbers: 71.35.-y, 71.70.Ej Submitted to: Journal of Physics: Condensed Matter ‡ To whom correspondence should be addressed. ha l-