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arXiv 1105.5317cond-mat.stat-mechhep-latquant-ph
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局域猝灭后的非平衡量子动力学

Non-equilibrium quantum dynamics after local quenches

Uma Divakaran, Ferenc Iglói, Heiko Rieger

摘要:

我们研究的量子动力学所产生的准备一个一维量子系统的基态的最初两个解耦的部分,然后连接在一起(本地淬火)。具体来说,我们专注于横向伊辛链和计算的磁化曲线,m_l(t),和关联函数在临界点,在铁磁有序相和顺磁相的时间依赖性。在临界点,我们发现有限尺寸标度形式的非平衡磁化和比较共形场论的预测与我们的数值结果。在铁磁相的磁化曲线很好地匹配我们的预测从准经典计算。

英文摘要:

We study the quantum dynamics resulting from preparing a one-dimensional quantum system in the ground state of initially two decoupled parts which are then joined together (local quench). Specifically we focus on the transverse Ising chain and compute the time-dependence of the magnetization profile, m_l(t), and correlation functions at the critical point, in the ferromagnetically ordered phase and in the paramagnetic phase. At the critical point we find finite size scaling forms for the nonequilibrium magnetization and compare predictions of conformal field theory with our numerical results. In the ferromagnetic phase the magnetization profiles are well matched by our predictions from a quasi-classical calculation.

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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