Study of Two Dimensional Electron System of Solids and Phase Transition.Due to High Density Excitation

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We started to perform this project in order to clarify two dimensional properties of the electronic excited states and the phase transition under high density excitation. At first, a very thin PbI_2 layer was made on the KCl substrate and it has been found that the translational motion of the exciton is size quantized and the self-trapped exciton becomes stable in the very thin layer. Secondly, from analysis of the luminescence at the interface between the dye and the semiconductor, it is known that the excited electron of the dye is transferred into the conduction band of the semiconductor. Thirdly, the CdTe film is made by ICB method and the better crystal has been found to be grown on the CaF_2 substrate with increasing the electron beam current. Fourthly, in the very fine particle of the CuCl crystal embedded in a NaCl crystal, the exciton has been found to be quantized. Especially, the excitonic molecule with the large binding energy is formed in such a microcrystal under the high density excitation.