摘要
使用密度泛函理论框架下的有限电场方法,系统地对同比例铅锡合金团簇(PbSn)n(n=1~10)的极化率和电偶极矩进行研究.团簇的电偶极矩与能隙在除n=4,8尺寸外表现出相似的演化趋势(同一尺寸下,高电偶极矩对应着宽能隙).另外,团簇平均极化率的演化方式与相对结构长度相同却与能隙相反,这说明电偶极矩和平均极化率的奇特变化主要是团簇电子结构和几何结构的贡献.从极化率随尺寸的演化趋势中进一步说明同比例铅锡合金团簇随尺寸的增加表现出微弱的金属性与半导体属性的相互转变行为.
The evolution of electric dipole moments and polarizabilities of (PbSn) n ( n = 1 -10 ) clusters has been studied using finite field method based on density functional theory (DFT). The energy gaps and electric dipole moments of clusters exhihit similar trend (the electric high-dipole moments correspond to wide energy gaps) except n = 4,8. Furthermore, the average polarizabilities present the same pattern with relative structure length, but show contrary trend to energy gap, this demonstrates that the electric dipole moments and polarizabilities are contributed by the electric and geometrical structures of alloy cluster with the same proportion. Importantly, the alloy clusters exhibit slender transformation between metallicity and semiconductor from the evolution of averaze polarizability.
出处
《四川师范大学学报(自然科学版)》
CAS
CSCD
北大核心
2013年第5期741-744,共4页
Journal of Sichuan Normal University(Natural Science)
基金
贵州省科学技术基金(黔科合J字[2011]2114号和黔科合J字[2013]2262号)
贵州省教育厅基金(黔教合KY字[2012]061号和黔教合人才团队字[2012]06号)
贵州省科技厅联合基金(黔科合J字LKK[2013]26号)资助项目