Computationally predicting spin semiconductors and half metals from doped phosphorene monolayers

First-principles computations are performed to investigate phosphorene monolayers doped with 30 metal and nonmetal atoms. The binding energies indicate the stability of all doped configurations. Interestingly, the magnetic atom Co doping induces the absence of the magnetism while the magnetism is realized in phosphorene with substitutional doping of nonmagnetic atoms (O, S, Se, Si, Br, and Cl). The magnetic moment of transition metal (TM)-doped systems is suppressed in the range of 1.0-3.97 μ_B. The electronic properties of the doped systems are modulated differently; O, S, Se, Ni, and Ti doped systems become spin semiconductors, while V doping makes the system a half metal. These results demonstrate potential applications of functionalized phosphorene with external atoms, in particular to spintronics and dilute magnetic semiconductors.     

温度概念中的物理学思想方法

温度概念在形成过程中包含了丰富的物理学思想方法,概念的建立见抽象概括,温度的测量见分析综合,温标的发展见质疑释疑,统计解释见唯象机理,正负温度见比较推理.     

高考试题在大学物理教学中的实用性及意义

以大学物理电磁学部分的教学内容为例, 通过实证研究, 对高考试题在大学物理教学中的实用性进行 探讨, 指出高考试题在检测中学物理知识的掌握程度, 确定大学物理的教学重难点; 利用学生已有的知识结构, 导 入大学物理的新课; 衔接中学物理与大学物理, 对比不同的的研究方法; 对比知识的广度和深度, 激发学生的学习 兴趣等方面具有的一定意义