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- spin density matrix 自旋密度矩阵
- Off-diagonal elements of density matrix go to zero. 经典定义:密度矩阵非对角元趋于零。
- Using the method of density matrix, we get the rate equations about electron transport in the mesoscopic system derived form many body schrodinger equation. Makeing using of them, we obtain the spin current and charge current through the systems. 本文利用密度矩阵的方法,由多粒子体系的薛定谔方程,我们得到了微观体系中电子输运的几率方程,从而推导出通过量子点的自旋电流与电荷流的表达式。
- In this paper, quantum coherences under weak interaction in A, AX, AMX and AFMX systems of which spin quantum number 1/2is,and in A and AX systems of which spin guantum number is 3/2 are calculated by using the density matrix. 本文用密度矩阵计算了在弱相互作用下,自旋都为1/2的核的A、AX、AMX与AFMX四种体系以及自旋都为3/2的核的A与AX两种体系中的各种量子相干。
- By solving the density matrix equations, we gained the susceptibility. 通过求解密度矩阵方程,得到感生极化率。
- The effects of the nearest neighbour Coulomb repulsion on the distribution of the charge density and the spin density are also discussed. 系统内的第三近邻电子跳跃相互作用与最近邻格点间电子Coulomb排斥相互作用之间存在着竞争。 此外,对系统中的电荷密度和自旋密度分布受最近邻格点间电子Coulomb相互作用影响情况亦进行了讨论。
- The condensed phases such as charge density wave (CDW), spin density wave (SDV) and superconducting phases are predicted within the random phase approximation (RPA). 在无规周相近似(RPA)范围内得到各种有序相:电荷密度波(CDW)、自旋密度波(SDW)及超导相存在的可能性,指出发生这些相变的条件。
- As temperature decreases, paramagnetic-commensurate spin density wave(CSDW)-incommensurate spin density wave(ISDW) transition occurs in the Cr97.02Al2.98 alloy. 随着温度降低;Cr97.;02Al2
- The effect of spin density wave on 2+1 dimensional BCS-type super-conductors with the next nearest neighbor interaction is investigated with themean-field approximation. 本文研究具有次近邻互作用的2+1维BCS型超导体与自旋密度波共存的系统。
- Keywords spin polarization;TRPM;density matrix; 电子自旋极化;TRPM;密度矩阵;
- A method is proposed to construct a localized active functional space from the density matrix of a large system. 报道了从大体系的密度矩阵出发构造定域于指定局部的活性泛函空间的方法和程序。
- We calculate variations of the charge density wave (CDW) and the spin density wave (SDW) gaps,ad well as their classical trajectory ? c,s with increasing on-site Coulomb repoulsion potential. 通过自旋密度波和电荷密度波的位相结构的变化 ;并结合其相应能隙的变化 ;得到以下结论 :系统的Ising相变与Mott相变不重合 ;中间有一个SDI(spontaneouslydimerizedinsulating)的过渡相 .
- Based on a theoretical model for interchain coupled quasi-one-dimensional organic ferromagnet, the charge density wave(CDW) and spin density wave(SDW) that exist in the system are investigated. 基于考虑链间耦合的准一维有机铁磁体的理论模型 ;对存在于系统内的电荷密度波 ( CDW)和自旋密度波 ( SDW)进行了研究 .
- In this paper, expound a semiclassical density matrix theory, it was used by Author in theoretical study of miniature optically pumped submillimeter wave laser. 重点论述在小型光泵亚毫米波激光的理论研究中所应用的量子系统的半经典密度矩阵理论。
- The atom's reduced density matrix is calculated when the quantum theory in small system coupled to thermal reservoir is used.The decoherence properties of atom is analyzed. 利用小系统与库耦合行为的量子理论,计算原子约化密度矩阵非对角元,分析原子状态的消相干特性。
- We start from the schrodinger equation, researching on the interaction process of cold atoms system with Raman laser pulse, and then educe the density matrix equation. 第二章推导出了原子与拉曼脉冲激光作用后的能态分布矩阵以及原子在重力场中的传输矩阵。
- When the density matrix of the whole ensemble consisted of system-meter is reduced to the microscopic physical system, the system trend quantum decoherence in nature. 把由系统与仪器组成的系综的密度矩阵约化到被测系统部分,于是自然趋近量子退相干。
- On the basis of optimized geometries,the charge densities,spin density,bond orders and electronic spectra of above molecule and cation have been calculated. 以优化构型为基础计算其电荷密度、自旋密度、键序和电子光谱。
- Density Matrices I. Initial Non-Eigenstate Preparation, Evolution, Detection. 19密度矩阵I.;初始非本征态的准备、演化、探试。
- Mean Field Theory and Spin Density Wave 平均场理论和自旋密度波