Interplay between External Strain and Oxygen Vacancies on Raman Spectra of SnO2

Comprehensive first-principle calculations on strained SnO2 crystal structure indicate that the formation energy of different types of oxygen vacancies depends on the external strain. Many novel Raman modes can be observed, their intensities and positions are strongly dependent on applied stain, which can be ascribed to crystal symmetry destruction by oxygen vacancies. Applied strain can compress/stretch distances between Sn and O atoms; therefore, Sn-O band vibration frequencies can be adjusted accordingly. Our calculated results disclose that the Raman spectra of SnO2 crystal structure with different types of oxygen vacancies are obviously different, which can be used to identify the oxygen vacancy types in strained Sn02 crystal structures.     

Spin transport properties in double quantum rings connected in series

A new model of metal/semiconductor/metal double-quantum-ring connected in series is proposed and the transport properties in this model are theoretically studied.The results imply that the transmission coefficient shows periodic variations with increasing semiconductor ring size.The effects of the magnetic field and Rashba spin-orbit interaction on the transmission coefficient for two kinds of spin state electrons are different.The number of the transmission coefficient peaks is related to the length ratio between the upper arm and the half circumference of the ring.In addition,the transmission coefficient shows oscillation behavior with enhanced external magnetic field,and the corresponding average value is related to the two leads’ relative position.     

用晶格玻尔兹曼方法进行空腔流虚拟实验

用晶格玻尔兹曼方法真实地再现了空腔流稳定流场的形成过程,将复杂系统模拟方法用于大学物理虚拟实验,有效地给学生创设了建构知识的学习环境,很好地解决了实验教学无法实施的问题。     

试论铅星形成的条件

由标准恒星演化模型以及参数化热脉冲模型的理论计算结果与天文观测数据的比较分析 ,论述了铅星形成所需的物理条件     

三终端多臂量子环中的持续电流

本文提出了三终端多臂量子环模型,并采用特殊方法来计算持续电流,研究发现：总磁通为零时,持续电流随半导体环增大做非周期和不等幅的振荡.总磁通不为零时,持续电流随AB磁通增强做周期性等幅振荡,Rashba自旋轨道耦合具有改变两种持续电流位相和位相差的效应. 平均持续电流的大小与各臂的臂长和所处的位置以及磁通分布相关.AB磁通对两种持续电流具有不同影响,两种持续电流是可分离的.     

Persistent spin currents in a triple-terminal quantum ring with three arms

A new model of a triple-terminal quantum ring with three arms is proposed.We develop an equivalent method for reducing the triple-terminal quantum ring to the double-terminal quantum ring and calculate the persistent spin currents in this model.The results indicate that the persistent spin currents show behavior of nonperiodic and unequal amplitude oscillation with increasing semiconductor ring size when the total magnetic flux is zero. However,when the total magnetic flux is non-zero,the persistent spin currents make periodic equal amplitude oscillations with increasing AB magnetic flux intensity.At the same time,the two kinds of spin state persistent spin currents have the same frequency and amplitude but the inverse phase.In addition,the Rashba spin-orbit interaction affects the phase and the phase difference of the persistent spin currents.The average persistent spin currents relate to the arm length and the terminal position as well as the distribution of the magnetic flux in each arm.Furthermore, our results indicate that the AB magnetic flux has different influences on the two kinds of spin state electrons.     

基于VR技术和Flash的物理实验交互式仿真

在计算机辅助教学中,交互性是一个衡量课件质量的重要指标。利用VR技术和FLASH设计物理交互式仿真实验,探讨根据物理定律动态实现物理实验VR技术对象的交互性技术关键。并给出劈尖薄膜干涉仿真实验的实例,可以通过改变劈尖倾角、透镜距离参数动态显示物理现象变化和获得物理实验数据。     

串联量子环自旋输运的性质

摘要：本文提出了金属/半导体/金属结构的串联量子环模型,研究表明：透射概率随半导体环增大发生振荡,AB磁通和Rashba自旋轨道耦合对两种自旋态电子的透射概率具有不同影响,A臂臂长和πR的比值与透射概率主共振峰的个数相关。透射概率随外加磁场增强发生振荡,其平均值随 角的减小而增大。     

国外学生对机械波理解的研究

通过对国外物理教育工作者关于学生对机械波理解的研究的介绍，概述在这些研究中所观察到的学生的困难，包括学生在波的传播（包括绳波和声波）、波的数学表述、波的叠加上的具体困难，了解学生对机械波基本概念的掌握情况，对我国的物理教学有一定的借鉴作用。     

基于Visual Foxpro大学物理题库管理系统框架的设计

利用VisualFoxpro 6 .0数据库软件 ,采用面向对象的程序设计方法 ,设计具有自动智能组卷、题库维护、试卷打印等功能的大学物理试题库管理系统框架。