EMP Formation in the Co(Ⅱ) Doped ZnTe Nanowires

Co(Ⅱ) doped Zn Te nanowires are prepared by a thermal evaporation method. The power and temperature dependent micro-photoluminescence spectra of single nanowire demonstrate the double bands near its band edge,and the ferromagnetism behavior for these nanowires is identified. The occurrence of excitonic magnetic polaron(EMP) can account for the second emission band for its higher binding energy and ferromagnetic coupling. This EMP formation in a nanostructure will facilitate to realize magnetic modulation on confined excitons and will find new applications for spinpolarized nanophotonic devices.     

一类新的非线性光学材料的研究——Fe2O3氧化物超微粒溶胶

80年代以来,超微粒材料的光学非线性引起了广泛的注意,其大的三阶光学非线性系数和快的响应,可能在光电子学中获得应用。这种非线性,是由具有量子尺寸效应(quantum size effect)的超微粒中的载流子限域运动(carrier confinement)和载流子间相互作用引起的,局域场效应(local field effect)可增强这一非线性过程^[1]。