PHOTOLUMINESCENCE STUDY OF InAs/GaAs SELF-ORGANIZED QUANTUM DOTS WITH BIMODAL SIZE DISTRIBUTION

We have investigated the temperature dependence of the photoluminescence (PL) spectrum of self-organized InAs/GaAs quantum dots. A distinctive double-peak feature of the PL spectra from quantum dots has been observed, and a bimodal distribution of dot sizes has also been confirmed by scanning tunneling microscopy image for uncapped sample. The power-dependent PL study demonstrates that the distinctive PL emission peaks are associated with the ground-state emission of islands in different size branches. The temperature-dependent PL study shows that the PL quenching temperature for different dot families is different. Due to lacking of the couple between quantum dots, an unusual temperature dependence of the linewidth and peak energy of the dot ensemble photoluminescence has not been observed. In addition, we have tuned the emission wavelength of InAs QDs to 1.3 μm at room temperature.     

富勒烯C60的固态聚合

综述了近年来固体C₆₀聚合理论和实验研究的最新结果，分析几种聚合途径各自的特点和共同之处.重点讨论了聚合的物理机制，指出由于聚合反应需要C₆₀分子处于特定的相对位置，自旋指向无序是发生聚合过程的重要前提. 关键词：     

Be掺杂InAs自组织量子点的发光特性

首次细致地研究了InAs量子点中直接掺杂Be对其发光特性的影响.光致发光(PL)谱的研究表明, 较低掺杂浓度时, 发光峰蓝移, 同时伴随着发光谱线变窄.而较高浓度的掺杂会对量子点的光谱特性产生不良的影响, 发光强度明显变弱.相信该研究对InAs自组织量子点在器件应用方面有很重要的意义.     

Pb(Zr1-xTix)O3中组分调制诱导的不寻常的铁电相

Pb(Zr1-xTix)O3(PZT)是一种重要的钙钛矿结构铁电固溶体，在其准同型相界处发现单斜相引起研究的热潮，文章报道了作者最近对沿着[100]赝立方方向组分调制的PZT体系的铁电性质的研究结果，发现组分调制导致极化偏离调制方向，在准同型相界附近诱导出新型的铁电三斜相和C型单斜相，以及极高的机电特性，证明偶极相互作用是导致以上行为的主要微观机制。     

论在物理教学中培养学生创造思维

以现代教育观念为指导 ,研究了物理教学中创新思唯的培养 ,结合教学实践 ,提出四大改进的措施。