拉伸应力作用下共轭高分子的能带结构研究

基于改进的SSH模型和弹性力学理论,研究了聚乙炔在单轴拉伸应力形变下的能带结构随应力大小的变化规律.计算结果表明:能带宽度和能隙随拉伸应力的增大而变窄,而能带宽度变化幅度要快于能隙的变化幅度.     

浅谈培养学生自我体育锻炼的能力

培养学生自我体育锻炼能力,则与终身体育密切相连的。在体育教学中,我们要培养学生能够运用所学的科学锻炼身体的理论和方法进行独立锻炼的能力,使学生不仅在限定的学习阶段里,而且在任何环境下都能独立自主地进行体育锻炼,即学生毕业后,在其漫长的一生中,能够根据自己的工作性质、     

Anisotropy of Electronic Spin Texture in the High-Temperature Cuprate Superconductor Bi2Sr2CaCu2O8+δ

Seeking new order parameters and the related broken symmetry and studying their relationship with phase transition have been important topics in condensed matter physics. Here, by using spin-and angle-resolved photoemission spectroscopy, we confirm the helical spin texture caused by spin-layer locking in the nodal region in the cuprate superconductor Bi₂Sr₂CaCu₂O_8+δ and discover the anisotropy of spin polarizations at nodes along Γ –X and Γ –Y directio...