arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.4479quant-phcond-mat.other
收藏

Rabi哈密顿量的优化t-展开法

Optimized t-expansion method for the Rabi Hamiltonian

Igor Travenec, Ladislav Samaj

摘要:

最近,关于$t$展开法在Rabi模型基态能量$E_0$计算中的适用性,引起了一场争论。对于试验函数的特定选择和非常大量的相关连接时刻,$t$ -扩展的结果是相当差的,并表现出相当大的振荡。在这封信中,我们制定的$t$ -扩展方法的试验功能,包含两个自由参数,捕获两个确切的可解极限的拉比哈密顿。在每一阶的$t$系列,$E_0$被假定为是固定的自由参数。对于少量(5或6个)的连通矩,$E_0$估计的精度很高,在整个Rabi Hamilton参数空间内,相对误差小于$10^{-4}$(0.01%).对试探函数进行特殊的对称化,使我们也能计算第一激发能$E_1$,其相对误差小于$10^{-2}$(1%)。

英文摘要:

A polemic arose recently about the applicability of the $t$-expansion method to the calculation of the ground state energy $E_0$ of the Rabi model. For specific choices of the trial function and very large number of involved connected moments, the $t$-expansion results are rather poor and exhibit considerable oscillations. In this letter, we formulate the $t$-expansion method for trial functions containing two free parameters which capture two exactly solvable limits of the Rabi Hamiltonian. At each order of the $t$-series, $E_0$ is assumed to be stationary with respect to the free parameters. A high accuracy of $E_0$ estimates is achieved for small numbers (5 or 6) of involved connected moments, the relative error being smaller than $10^{-4}$ (0.01%) within the whole parameter space of the Rabi Hamiltonian. A special symmetrization of the trial function enables us to calculate also the first excited energy $E_1$, with the relative error smaller than $10^{-2}$ (1%).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑