关于费米子玻色化技术的注记

传统根据Jordon和Wigner理论,构造了费米子玻色化方案.讨论证明了这种方案只在k≠k′时才成立,而在k=k′时则不成立,从而说明了费米子的玻色化技术是不完备的.     

用路径积分法导出(1+1)维费米场的非阿贝尔玻色化

本文利用随动表象下处理反常问题的路径积分方法¹⁵,给出(1+1)维空间费米场玻色化的统一推导方案.有外电场的无质量Thirring模型,以及有内部SU(N)对称性的Gross-Neveu模型,分别作为阿贝尔和非阿贝尔玻色化的例子.     

费米—狄拉克分布和玻色—爱因斯坦分布的简单推导

给出一种用初级数学手段导出费米－狄拉克分布和玻色－爱因斯坦分布的方法。     

玻色-爱因斯坦凝聚领域Feshbach共振现象研究进展

Feshbach共振现象是当前玻色一爱因斯坦凝聚领域中的一个研究热点．目前在大多数低温碱金属原子气体里都已观测到Feshbach共振现象．在实验里利用Feshbach共振可以任意改变这些系统中原子之间的相互作用强度，从强相互排斥作用到强相互吸引作用都可以实现．文章详细介绍Feshbach共振现象以及目前它在原子气体系统里的最重要的两个应用，研究费米子气体里的超流态和有强相互作用的玻色子气体．     

QGP强子化的多粒子玻色–爱因斯坦关联分析

计算了由夸克–胶子等离子体(QGP)颗粒表面强子化所产生的π介子和K介子的多粒子玻色–爱因斯坦关联.对有限初始重子数密度的情况,K⁺介子的多粒子关联比π介子的多粒子关联弱,K^－介子的平均多粒子关联强度随QGP颗粒数目N_d的增加而快速下降.在零初始重子数密度情况下,K⁺和π介子的平均多粒子关联强度的差别随N_d的增加而变得明显.     

q类似玻色算符的逆算符及其应用

在q类似Fock空间中引入了q类似玻色算符的逆算利用的性质,构造了增光子相干态的q形变形式并讨论其完备性关系.     

量子超代数splq(2,1)的q变形玻色-费米表示

本文分别运用一对q变形玻色算符、一对q变形费米算符与两对q变形玻色算符、两对q变形费米算符,给出了量子超代数spl_q(2,1)的两种q变形玻色-费米实现.     

Ashkin-Teller量子链的玻色化形式及其新的临界点

运用连续极限和玻色化方法讨论了Ashkin-Teler量子链的临界点，验证了其他作者给出的临界条件，并预言了Ashkin-Teler量子链可能存在新的临界点 关键词：     

双势阱中玻色-费米混合气体的周期调制效应

在周期调制场下, 通过对双势阱中费米子数目及相互作用参数的调节, 研究了该系统中玻色子的自俘获现象. 研究发现, 系统中费米子数目及相互作用参数都会影响玻色子的自俘获现象, 并且随着 相互作用及粒子数目的变化, 玻色子的自俘获发生临界现象. 关键词： 玻色-费米混合气体 周期调制 自俘获     

Boson-fermion relations in several dimensions

Zero and positive temperature fermion field operators in several dimensions are constructed as stochastic integrals of certain reflection valued processes with respect to the corresponding boson field operator processes. The authors felicitate Prof. D S Kothari on his eightieth birthday and dedicate this paper to him on this occasion.     

Gauge invariance and quantization applied to atom and nucleon internal structure

The prevailing theoretical quark and gluon momentum, orbital angular momentum and spin operators, satisfy either gauge invariance or the corresponding canonical commutation relation, but one never has these operators which satisfy both except the quark spin. The conflicts between gauge invariance and the canonical quantization requirement of these operators are discussed. A new set of quark and gluon momentum, orbital angular momentum and spin operators, which satisfy both gauge invariance and canonical momentum and angular momentum commutation relation, are proposed. To achieve such a proper decomposition the key point is to separate the gauge field into the pure gauge and the gauge covariant parts. The same conflicts also exist in QED and quantum mechanics, and have been solved in the same manner. The impacts of this new decomposition to the nucleon internal structure are discussed.     

Nucleon internal structure: a new set of quark, gluon momentum, angular momentum operators and parton distribution functions

It is unavoidable to deal with the quark and gluon momentum and angular momentum contributions to the nucleon momentum and spin in the study of nucleon internal structure. However we never have the quark and gluon momentum, orbital angular momentum and gluon spin operators which satisfy both the gauge invariance and the canonical momentum and angular momentum commutation relation. The conflicts between the gauge invariance and canonical quantization requirement of these operators are discussed. A new set of quark and gluon momentum, orbital angular momentum and spin operators, which satisfy both the gauge invariance and canonical momentum and angular momentum commutation relation, are proposed. The key point to achieve such a proper decomposition is to separate the gauge field into the pure gauge and the gauge covariant parts. The same conflicts also exist in QED and quantum mechanics and have been solved in the same manner. The impacts of this new decomposition to the nucleon internal structure are discussed.     

Nucleon internal structure: a new set of quark, gluon momentum, angular momentum operators and parton distribution functions

It is unavoidable to deal with the quark and gluon momentum and angular momentum contributions to the nucleon momentum and spin in the study of nucleon internal structure. However we never have the quark and gluon momentum, orbital angular momentum and gluon spin operators which satisfy both the gauge invariance and the canonical momentum and angular momentum commutation relation. The conflicts between the gauge invariance and canonical quantization requirement of these operators are discussed. A new set of quark and gluon momentum, orbital angular momentum and spin operators, which satisfy both the gauge invariance and canonical momentum and angular momentum commutation relation, are proposed. The key point to achieve such a proper decomposition is to separate the gauge field into the pure gauge and the gauge covariant parts. The same conflicts also exist in QED and quantum mechanics and have been solved in the same manner. The impacts of this new decomposition to the nucleon internal structure are discussed.     

Completeness Relation of the SU(3) Charged and Hypercharged Coherent State

Using the MelJin inversion formulas we derive the weight function for constructing the completeness relation of the boson SU(3) charged and hypercharged coherent state. A suitable contour integration is selected for this derivation.     

交错网格下MHD相容守恒格式的发展

在低磁场雷诺数条件下,基于电势泊松方程,发展了交错网格下可以精确计算电流和洛伦兹力(电磁力)的相容守恒格式。采用压力为变量的原始变量法求解不可压缩Navier-Stokes方程,所计算的电流满足电荷守恒定律,所计算的电磁力满足动量守恒定律。对金属流体在Hartmann数50~5000范围内验证了格式的精确性。交错网格下相容守恒格式的发展为后续MHD稳定性分析、湍流的大涡模拟及直接数值模拟提供很好的选择。     

大功率GaN基发光二极管的电流扩展效应及电极结构优化研究

定性分析了GaN基LED的电流扩展效应,发现电流密度和电流横向扩展的有效长度对电流均匀扩展有很大影响.基于此,对GaN基大功率LED提出了优化的电极结构,以减缓电流拥挤效应,降低器件串联电阻.通过用红外热像仪测量器件表面的温度分布,发现具有优化的环形插指电极结构的GaN基大功率LED表面温度分布比较均匀,证明芯片接触处电流扩展均匀,局部电流密度降低,减小了焦耳热的产生,增强了器件的可靠性. 关键词： 氮化镓 发光二极管 电流扩展 电极结构优化     

大功率GaN基发光二极管的电流扩展效应及电极结构优化研究

定性分析了GaN基LED的电流扩展效应，发现电流密度和电流横向扩展的有效长度对电流均匀扩展有很大影响.基于此，对GaN基大功率LED提出了优化的电极结构，以减缓电流拥挤效应，降低器件串联电阻.通过用红外热像仪测量器件表面的温度分布，发现具有优化的环形插指电极结构的GaN基大功率LED表面温度分布比较均匀，证明芯片接触处电流扩展均匀，局部电流密度降低，减小了焦耳热的产生，增强了器件的可靠性.