Numerically exact solution to the finite-size Dicke model
Numerically exact solution to the finite-size Dicke model
复制标题
有限尺寸 Dicke 模型的数值精确解
DOI：
10.1103/physreva.78.051801
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发表时间：
2008-11-01
影响因子：
2.9
通讯作者：
Wang, Ke-Lin
中科院分区：
文献类型：
--
作者：
Chen, Qing-Hu;Zhang, Yu-Yu;Wang, Ke-Lin
利用扩展玻色相干态，提出了一种精确求解迪凯模型的数值方法。可触及的系统尺寸比文献中报道的高两个数量级。分析了基态能量、Berry相位和并发度等观测量的尺度标度。找到了基态能量的标度指数，并调和了共存标度指数中存在的矛盾。
By using extended bosonic coherent states, a technique to solve the Dicke model exactly is proposed in the numerical sense. The accessible system size is two orders of magnitude higher than that reported in the literature. Finite-size scaling for several observables, such as the ground-state energy, Berry phase, and concurrence, is analyzed. A scaling exponent for ground-state energy is found. An existing discrepancy in the scaling exponent of the concurrence is reconciled.