排序方式: 共有10条查询结果,搜索用时 546 毫秒
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凝聚态和相变物理的一个重要部分是研究有序相的状态和缺陷,近二十年来,应用代数拓扑学方法对有序介质的状态和缺陷进行分类,增进了人们对相变等过程的认识,从而引起广泛的注意,虽然从本质上说,缺陷拓扑分类也可纳入状态拓扑分类的框架,国际上迄今的有关研究却主要针对缺陷;除织构(孤子)态外,对一般状态甚少涉及,本文试图 相似文献
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对于Hamiltonian随时间作周期变化的量子系统中状态的演化,Bloch定理亦成立,并可据此定义一种新的几何相位———Bloch相位.证明用这种新的几何相位可以把迄今发现的所有同步(即量子态演化一周后获得的)几何相位统一起来,即Bloch相位等于Pancharatnam相位、Aharonov-Anandan相位和Lewis-Riesenfeld相位,并且在绝热条件下化为Bery相位.为此,先对Pancharatnam相位、Aharonov-Anandan相位和Lewis-Riesenfeld相位的定义作等价的改变,使它们变得有物理意义,并把Lewis-Riesenfeld相位和Berry相位推广到简并情形.还讨论了Bloch相位的求解问题
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TOPOLOGICAL CLASSIFICATION OF 3D AND 2D SPIN STATES IN THE FERROMAGNETS CONTAINING ANNULUS- AND CYLINDER-TYPE CAVITIES 总被引:1,自引:0,他引:1 下载免费PDF全文
Methods of algebraic topology have been employed to classify ordinary (3D) and planar (2D) spin states in the ferromagnets containing annulus- and cylinder-type cavities. The main result of this paper is that the sets of homotopy classes of 3D and 2D spin states in a ferromagnet containing m non-winding up annulus-type cavities threaded by k cylinder-type cavities can be constructed into groups isomorphic to Zm and Zm+k, respectively. Here m,k = 0, 1, 2,…,Zl denotes the l-dimensional discrete vector group. 相似文献
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在地心参照系中对地球赤道上落体偏东的计算 总被引:6,自引:2,他引:4
本文以突出落体偏东的物理图象为目的,在地心参照系中求出了地球赤道上落体偏东的大小,并指出现行理论力学教材中的结果是本文结果的近似情况。 相似文献
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TOPOLOGICALCLASSIFICATIONOF3DAND2DSPINSTATESINAFERROMAGNETINCLUDINGANANNULARCAVITY阎凤利,李伯臧¥YanFengli(Dept.ofPhys,HebeiTeachers... 相似文献
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APPLYING THE HOMOTOPY EQUIVALENCE TRANSFORMATION OF TOPOLOGICAL SPACE SETS TO THE TOPOLOGICAL CLASSIFICATION OF STATES AND DEFECTS IN ORDERED MEDIA 下载免费PDF全文
In this paper the application of homotopy equivalence transformation (HET) of topological space sets to the topological classification of states and defects in ordered media is discussed. Firstly, an argument is pres-ented about the idea that for simplifying and even working out the classification and constructing homotopy class sets into groups, it is crucial to utilize the HET. As the theoretical basis for doing this we sum up the relevant results in homotopy theory into a theorem, called the "invariance theorem for HET". Secondly, in order to favor the utilization of this theorem, several propositions on homotopy equivalence between space sets are given. Finally, the absolute and relative topological dassification of states and defects is systemtically studied. The main results obtained are embodied in eight theorems. 相似文献
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p=2U/3V系统的态函数形式 总被引:2,自引:0,他引:2
给出了压强p、内能U和体积V满足p=2U/3V的系统的态函数形式。并据此讨论了理想 玻色气体、理想费米气体和通常的理想气体的状太民方程不同的热力学原因。 相似文献
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