量子运动的经典极限和Fejer平均值

通过对一维无限深势阱的量子运动严格的解析计算表明,经典极限下,量子力学中的物理量在等权波包下的期望值,趋于经典力学量物傅立叶级数的Fejer平均值,而不是傅立叶级数本身,而且,当等权波包中叠加的本征态的数目N等于量子数n的平方根时,等权波包的不确定性最小。     

量子力学和相对论的结合、不相容及发展

基于量子力学和相对论的比较,二者既可以结合又存在不相容.由此讨论它们的某些可能的发展方向.特别探讨了3个方面:测不准原理和光速恒定等的矛盾;量子的非局域性显示出纠缠态应该是一种新的作用距离和强度中等的相互作用;由Dirac负能态推导出的负物质可能是一种暗物质.       

Supersymmetry and the Dirac Equation with Vector and Scalar Coupling Potentials

Sinceasimpleexampleofanon-relativisticsupersymmetricquantummechanicalsystem,aspin-12particlemovinginone-dimensionalspace,wasconstructedbyWitten[1]todiscussdynamicalbreakingofsupersymmetry,extensivestudieshavebeendevotedtomanyaspectsofsupersymmetricquantummechanics(SUSYQM)[2,3].In1984,Ui[4]firstprovedthatinthree-dimensionalspace-time,theDiracequationofafermioninteractingwithagaugefieldcanbebroughtintotheframeworkofsupersymmetricquantummechanics.Sincethen,supersymmetryinrelativisticquantummec…     

InGaAs/InP量子阱材料生长后置无序技术的研究

研究了氖离子注入诱导 In Ga As/In P量子阱材料带隙变化的规律 .研究结果表明 ,由氖离子注入引起量子阱带隙蓝移 .蓝移的大小与量子阱的宽度 ,阱距表面深度 ,注入离子剂量 ,能量 ,及退火条件有关 .研究所得的参数对设计量子阱集成光器件有重要参考价值     

以EPR纠缠为基础的量子密钥分配

提出了一种以EPR纠缠为基础的新的量子密钥分配方案.不需要密钥双方Alice,Bob进行测量基的选择,提高了传输产生的密钥效率.同时,检测偷听者需要对比更少的量子位.     

Abnormal Raman spectral phenomenon of silicon nanowires

The Raman spectra of two one-dimensional silicon nanowire samples with different excitation wavetengths were measured and an abnormal phenomenon was discovered that the Raman spectral features change with the wavetengths of excitation. Closer analysis of the crystalline structure of samples and the changes in Raman spectral features showed that the abnormal behavior is the result of resonance Raman scattering setection effect.     

动态椭偏光谱技术及其在薄膜测量中应用的研究

文章介绍了动态反射式椭圆偏振光谱技术的原理,采用椭圆偏振光谱技术测量得到P型Si(111)晶片,利用直流溅射制备的不同厚度Cu膜样品的椭偏光谱;利用特定的解谱程序并结合实验参数,对椭偏光谱进行解谱得到了样品的光学常数谱及其厚度;对于P型Si(111)晶片的光学常数谱,通过与Palik数据比较可以发现两者极为相似,只是在数值上存在差异;对于不同厚度的Cu膜样品,从晶粒尺寸、致密度和缺陷等方面分析了光学常数随厚度变化的原因;通过分析比较得知,经过拟合计算得到的P型Si(111)晶片和Cu膜样品的光学常数具有很高的准确性。     

量子点在小鼠体内的生物学分布

对CdTe量子点在小鼠体内的生物学分布进行了研究. 实验表明, 量子点在小鼠体内通过血液循环系统运输到肝脏和脾脏, 24 h之内在这两种脏器中能够观察到量子点的存在, 同时有红移现象发生, 随着时间的延长, 量子点在这两大脏器中的量越来越少, 直到消失. 用量子点作为标记物研究纳米粒子在生物体内的运输、 分布和代谢具有操作简便、 安全、 结果直观等特点.     

Suppressing spacetime emergence

One of the primary tasks in building a quantum theory of gravity is discovering how to save spatiotemporal phenomena using a theory which, putatively, does not include spacetime. Some have taken this task a step further and argue for the actual emergence of spacetime from a non-spatiotemporal ontology in the low-energy regime. In this paper, it is argued that the account of spacetime emergence presented in Huggett and Wüthrich (2013) and then assumed in Baron (2019), Crowther (2016), Wüthrich (2017), and Wüthrich and Lam (2018) fails to accomplish the task to which it is set. There is a prima facie contradiction between the scale-independent ontology of spacetime in GR and the scale-dependent account of emergence proposed by this literature. One can avoid this contradiction but only at the cost of changing the target of emergence and by endorsing a perspectival theory of ontology – a view I call “ontic-perspectivism”. Though this paper explicitly addresses spacetime emergence, many of the following arguments are applicable to other accounts where objects of ontology, or their properties, are claimed to emerge in the low-energy regime.     

半导体纳米环中激子的磁场效应

在有效质量近似下,采用矩阵对角化方法,研究了半导体纳米环中激子的磁场效应.研究发现半导体纳米环中激子的谐振子强度随磁通变化呈现Aharonov-Bohm振荡,振子强度的振幅随纳米环的半径增加而减少.讨论了线性、三阶非线性和总光学吸收系数随环半径和磁通的变化关系,结果表示半导体纳米环中激子的光吸收随磁通的变化显示Aharonov-Bohm效应.