无规磁场下自旋-1/2海森堡链的量子关联与多体局域化相变

来源 :量子光学学报 | 被引量 : 0次 | 上传用户:tingtngliok
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
本文用两格点的量子关联研究无序系统的多体局域化相变。利用精确对角化的数值方法计算了无规磁场下自旋-1/2海森堡链的相邻本征态的两格点量子失谐之差与量子纠缠之差。结果表明在遍历相,相邻本征态的两格点量子失谐之差随链长的增长而逐渐趋近于零;而在多体局域化相,随链长的增长仍保持相对较大的值,这是多体局域化本征态违背本征态热化假定的反映,因此,相邻本征态的两格点量子失谐之差是研究多体局域化相变的有效工具。同时,与相邻本征态的两格点量子纠缠之差相比,分析发现用有限系统的量子失谐研究多体局域化相变比量子纠缠更具有优势。
其他文献
Spin (polarization) is widely used in free-space optics, while in photonic integrated circuits (PICs), information is usually encoded in optical route. So a practical way to connect these two encoding methods is necessary for information communication. In
We demonstrate a diode-pump Tm3
Metasurfaces have become a new photonic structure for providing potential applications to develop integrated devices with small thickness, because they can introduce an abrupt phase change by arrays of scatterers. To be applied more widely, active metasur
In this work, it has been demonstrated that in order to fully understand the terahertz (THz) pulse generation process during femtosecond laser filamentation, the interaction between THz wave and air plasma has to be taken into account. This interaction is
Eccentric photorefraction usually is used as early eyesight diagnostic test of infants and small children. Unlike currently approved geometrical optical model of eccentric photorefractometer, the crescent formation and the light-intensity distribution in
A microwave photonic link (MPL) with high spurious-free dynamic range (SFDR) is proposed and analyzed. The optical carrier is divided equally into two paths. The path 1 is modulated by radio frequency (RF) signals in a Mach-Zehnder modulator (MZM), and th
期刊
A contention resolution scheme, P-cycle auto-switching (PCAS), is proposed in wavelength-switched optical networks (WSONs) based on generalized multi-protocol label switching (GMPLS) to solve backward blocking. This system permits the preferable request a
期刊
We describe a compact beam splitter based on grating-assisted coupler which consists of Bragg grating sandwiched between two parallel waveguides on the silicon-on-insulator platform. The coupled-mode theory is an important method to analyze waveguide stru
针对常规的点云滤波方法在去除接近模型噪声的过程中会对模型造成较大破坏的问题,提出一种结合双张量投票和多尺度法向量估计的点云滤波算法。首先采用主成分分析法在较大的尺度下估计各点的法向量,对各点进行双张量投票以提取特征点。然后对提取出的特征点在较小的尺度下估计法向量,并结合随机采样一致性方法对小范围噪声平面进行剔除。最后采用曲率对剩余的噪声进行滤波,获得最终的点云数据。实验结果表明,所提算法可以有效剔