无序电子系统中自旋轨道散射对Hall电导率的影响

利用微扰论中的图形技术讨论了层状准二维无序电子系统中自旋轨道散射效应的有关问题。得到作为层间耦合函数的Cooperon（粒子－粒子通道的传播函数）的表达式，以及对Hall电导率量子相干修正的解析表达式，它是弹性、非弹性和自旋轨道散射时间的函数。强耦合和弱耦合分别对应于三维和二维的情况。Hall系数变为零。此外还讨论了随层间耦合的减小由三维到二维的维度跨越行为和维度跨越的条件。该理论可以应用于解决超晶格中的电子输运问题。     

基于自旋轨道耦合效应的能带分裂机理

从理论上导出了自旋与p轨道耦合效应使能带分裂的具体表达式,阐明了能带分裂的物理机理,讨论了自旋轨道耦合效应使价带顶分裂后能带结构的特征。其结果有助于更深刻的理解自旋轨道耦合引起能带分裂的机理,对研究半导体光学选择定择、输运性质及应变量子阱中能带的分裂也提供了重要的理论基础。     

Rashba自旋轨道耦合下宽量子线中的自旋流

利用硬壁限制势下Rashba自旋轨道耦合量子线波函数以及一个自旋流定义来计算宽量子线中的自旋流密度,得到了两个非零线自旋流密度分量及一个净自旋流密度,发现随着量子线通道数及Rashba自旋轨道耦合作用的增加以上三个自旋流密度会随之增强,此外利用自旋流产生的可被检测电场可提供一个对自旋流进行检测和调控的方法.     

正多边形量子环链自旋输运性质研究

研究了考虑Rashba自旋轨道耦合的任意正多边形量子环链的自旋输运性质.当不考虑Rashba自旋轨道耦合时,量子环链中电子的透射电导不发生自旋极化和翻转;当考虑Rashba自旋轨道耦合时,Rashba自旋轨道耦合可以控制量子环链中电导的极化.点连接的量子环链透射电导存在奇偶震荡现象,线连接的量子环链透射电导的极小值不随链长度变化.     

Rashba多量子阱异质结中自旋轨道耦合效应对电子输运的影响

根据量子相干输运理论,利用传递矩阵的方法,研究自旋电子在铁磁体（F）／半导体多量子阱（SWM）／铁磁体的一维结构中,考虑自旋轨道耦合效应时的量子相干输运的特性．通过计算发现在这种一维多量子阱结构中的自旋电子的输运特性发生了一定的变化．这有利于进一步提高自旋电子的隧穿系数和自旋极化率．     

自旋三极管中电子隧穿系数的数学推导

利用传递矩阵方法，在同时考虑自旋轨道耦合效应和量子尺寸效应情况下，分别计算了没有外场、外加磁场、电场时，透射概率的变化关系。     

关于原子物理中两个问题的注记

一、对LS耦合和JJ耦合的说明 以两个电子的原子为例。我们知道，每个电子有自旋和轨道运动，那么一个双原子中四种运动之间可以有六种相互作用，即G1（s1 s2），G2（l1 l2），G3（l1s1。），G4（l2s2），G5（l1s2），G6（l2s1）。这里G1代表两个电子的自旋的相互作用，G3是一个电子的轨道运动和他自己的自旋间的相互作用，与类推。那么哪种相互作用强一些，那种弱一些？何时采用LS耦合，何时采用JJ耦合？很多教材中说G5和G6是比较弱的，可以不考虑，但G1和G2与G3和G4的比较分两种情况：一种是当G1和G2比G3和G4强，采用LS耦合，另一种情况是当G3和G4比G1和G2强时，采用JJ耦合。     

一维介观环中自旋─轨道耦合诱发的持续电流

本文证明了一堆介观环中由非对称禁闭势导致的自旋一轨道（ＳＯ）耦合等效于一个与电子动量相关的有效磁场，并进而研究了该等效磁场下的绝热近似和持续电流。结果表明，由ＳＯ耦合产生的持续电流与纯ＡＢ磁通产生的电流在零温情况下可以解除耦合；并且ＳＯ耦合产生的持续电流的方向取决于ＳＯ的参数，方向不同时，既可促进也可抑制总电流。     

固体磁性的量子调控

本文介绍自旋电子学研究领域中近期十分活跃的方向之一:固体磁性的量子调控。重点介绍包括利用自旋极化电流来调控磁矩的自旋转移矩效应、利用电场来调控体系磁性及磁电耦合效应、利用光场来调控磁性的飞秒磁学以及利用温度梯度来产生电动势的自旋塞贝克效应等的最新研究进展。     

双磁势垒结构中电子自旋极化输运

利用散射矩阵方法研究了双磁势垒结构中二维电子气的自旋极化输运性质.结果表明:电子的自旋极化输运性质与磁场构型、入射电子的能量、入射电子的波矢和外加偏置电压有关.在双磁势垒的磁场结构中只有两磁势垒不对称时,自旋向上和自旋向下的电子的传输概率才发生分离,电子隧穿不对称双磁势垒结构表现出自旋过滤效应.     

自旋轨道耦合作用下的电子双折射研究

在这篇文章中,我们主要研究了对于一个给定入射电子态,在Rashba Spin-Orbit Coupling作用下的无序系统界面处的散射,除了正入射外,电子的双折射现象将会出现,这种情况下与光子的双折射情况类似。对于全反射的情况我们研究表明存在两个极限角,通过控制Rashba Spin-Orbit Coupling作用的强度,控制折射的两个极限角,双折射的控制允许利用单界面产生自旋过滤。通过研究不同空间的电子能谱与波函数,为求介观体系的电导提供了一种方法。     

Spin-orbit coupling modification of photons to ray equation in inhomogeneous medium

Based on the principle of general relativity, geometrization of interaction, the interaction of the inhomogeneous isotropic medium to light can be equated to a non-Euclidean geometry field just like the situation of gravity, i.e., light travels in the null geodesic in the non-Euclidean curved space-time, which is equivalent to the Fermat principle for the inhomogeneous media. In this paper, the propagation of light in an inhomogeneous media is studied by means of the effective metric theory. The modification to the classical ray equation of photons is derived from the geodesic equation of photon by considering the spin effect of photons, which is induced via the spin-orbit coupling of photons, and the corresponding Hamiltonian of photon is proposed. Based on the spin-orbit coupling of photon, a light splitting phenomenon emerges in the inhomogeneous media, which is the spin hall effect of photon.     

The conductance and polarization in quantum wires with Rashba and Dresselhaus spin-orbit interactions

The conductance and polarization are studied in one-dimensional ballistic quantum wire with both Rashba and Dresselhaus spin-orbit interactions.Two kinds of structures are considered in the present work,one with mixture of two interactions and the other with sequence structure of them.We find that the conductance and polarization are strongly affected by these two interactions.With both interactions we obtain a multi-peak contour of spin polarization and a dramatic oscillation pattern of spin conductance,which are due to the different combination of the two spin-orbit interactions.     

Mayer-Jensen shell model and magic numbers

Many nuclear models have been put forward since 1932. Among them the collective model proposed by Aage Niels Bohr and Ben Roy Mottelson and the nuclear shell model proposed by Maria Goeppert Mayer and Johannes Hans D Jensen are the two most successful models. A number of experimental facts like the existence of magic numbers compiled by Maria Mayer led to the discovery of the nuclear shell model. The addition of a nuclear spin-orbit coupling force to the mean field of the nucleons successfully predicted the nuclear magic numbers and many other properties of nuclei. R Velusamy is the Head of the PG Department of Physics, Ayya Nadar Janaki Ammal College, Sivakasi, Tamilnadu. His current interests are in quantum dots and wave packet dynamics.     

自旋轨道相互作用对负宇称重子混合角的影响

通过对单交换势(OPE)结构的重新分析,并考虑自旋轨道相互作用的影响,得到的负宇称重子混合角与实验结果吻合.     

确定多个同科电子原子态的字母组合法

利用L-S耦合的方法和泡利不相容原理,给出了确定多个同科电子原子态的一种方法,称之为字母组合法,并用若干具体例子加以说明.结果表明,该方法是确定多个同科电子原子态的一种很有效的方法.     

光折变晶体热透镜效应中光孤子传输与耦合特性的研究

借助双波导孤子耦合模型，通过非线性薛定谔方程分析了光折变晶体热透镜效应中光孤子的传输与耦合特性，研究结果表明：光折变晶体热透镜效应的实质就是光孤子耦合的结果，光孤子传输与耦合特性与两波导中光孤子的相对位相有密切关系。     

Mechanical Behaviors of Silt Rock Subjected to Coupling Static and Impact Loads

Experiments of silt rock subjected to coupling loads were carried out on tailormade equipment. With a constant dynamic load, the behaviors of eight sets of siltite specimens were investigated with different axial static loads. The experimental results show that the modulus of the specimens under coupling loads increases at first and then decreases with the increase of axial static pressure. The failure model of the specimens also varies. Keeping the dynamic load constant, when the axial static pressure is low, the specimen breaks in two simply. With the increase of axial static pressure, the cone-shaped fragment appeares. When the axial static pressure reaches 90% of the static strength of rock, the specimen smashes into amount of small fragments.     

Mechanical Behaviors of Silt Rock Subjected to Coupling Static and Impact Loads

Experiments of silt rock subjected to coupling loads were carried out on tailormade equipment. With a constant dynamic load, the behaviors of eight sets of siltite specimens were investigated with different axial static loads. The experimental results show that the modulus of the specimens under coupling loads increases at first and then decreases with the increase of axial static pressure. The failure model of the specimens also varies. Keeping the dynamic load constant, when the axial static pressure is low, the specimen breaks in two simply. With the increase of axial static pressure, the cone-shaped fragment appeares. When the axial static pressure reaches 90% of the static strength of rock, the specimen smashes into amount of small fragments.