Effects of hydrogenic donor impurity position on the binding energy of a bound exciton in Ⅲ-nitrides quantum dots;

The effects of calcining temperature and Sn dopant content on the properties of photoinduced charges of TiO2 were discussed in details, and the relationships between the structure and bound excitons as well as the characteristics of bound excitons of the as-prepared samples were reveale.

This paper calculates the ground state energy and binding energy of abound exciton in GaAs/Ga1-xAlxAs material by using variational method and discussesthe results obtained.

In the paper the confinement factor for square-power gain-guiding optical fibers is focused on while the optical wave being guided in gain and refraction,the form of the fields is given at first for the new type of optical fiber,then the expressions of confinement factor is obtained from Poynting s theorem,o.