Size-quantization stark effect in quasi-zero-dimensional semiconductor structures

A theory of the size-quantization Stark effect in semiconductor nanocrystals under conditions in which the polarization interaction of an electron (hole) with a nanocrystal surface plays the dominant role is developed. It is shown that, in the region of interband absorption, the shifts of electron (hole) size-quantization levels in a nanocrystal subjected to an external homogeneous electric field are governed by the quadratic Stark effect. A new electrooptical method is proposed furnishing an opportunity to determine the critical radii of nanocrystals in which bulk excitons can appear.