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arXiv 0709.1809cond-mat.str-elhep-th
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有边界量子伊辛链的动力学响应函数

Dynamical response functions in the quantum Ising chain with a boundary

Dirk Schuricht, Fabian H. L. Essler

摘要:

我们确定了在边界磁场存在下半直线上量子伊辛链在标度极限下的动力学响应函数$<{\cal O}^\dagger(t,x_1){\cal O}(0,x_2)>$。使用无限体积形状因子和边界状态的谱表示,我们推导出的相关器,被发现是迅速收敛,只要$|\frac{x_1+x_2}ξ|\agt 0.2$其中$ξ$是相关长度的扩展。在足够晚的时候,我们观察到的振荡行为的相关性任意远离边界。我们调查的边界束缚态,是目前的边界磁场的范围内的影响。

英文摘要:

We determine dynamical response functions $<{\cal O}^\dagger(t,x_1){\cal O}(0,x_2)>$ in the scaling limit of the quantum Ising chain on the half line in the presence of a boundary magnetic field. Using a spectral representation in terms of infinite volume form factors and a boundary state, we derive an expansion for the correlator that is found to be rapidly convergent as long as $|\frac{x_1+x_2}ξ|\agt 0.2$ where $ξ$ is the correlation length. At sufficiently late times we observe oscillatory behaviour of the correlations arbitrarily far away from the boundary. We investigate the effects of the boundary bound state that is present for a range of boundary magnetic fields.

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。

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