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arXiv 1604.03571cond-mat.stat-mech
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不可积模型量子猝灭后的实时约束

Real time confinement following a quantum quench to a non-integrable model

M. Kormos, M. Collura, G. Takács, P. Calabrese

摘要:

关联和纠缠的光锥扩展是多体量子系统非平衡猝灭动力学的一个重要特征。首先在理论上提出,它已在冷原子气体中实验揭示,预计它将成为短程相互作用和无无序系统中任何猝灭的一般特征。相反,在这里,我们提出了一种机制,通过限制的基本激发,强烈抑制光锥传播。禁闭是粒子物理学中的一个著名概念,但它也存在于凝聚态系统中,最明显的是在实验中观察到的一维空间中。我们的结果是针对具有横向和纵向磁场的Ising自旋链得到的,但所提出的机制是普遍有效的,因为它是基于唯一的禁闭概念,而且在冷原子实验中很容易观察到。

英文摘要:

Light cone spreading of correlations and entanglement is a key feature of the non-equilibrium quench dynamics of many-body quantum systems. First proposed theoretically, it has been experimentally revealed in cold-atomic gases and it is expected to be a generic characteristic of any quench in systems with short-range interactions and no disorder. Conversely, here we propose a mechanism that, through confinement of the elementary excitations, strongly suppresses the light-cone spreading. Confinement is a celebrated concept in particle physics, but it also exists in condensed matter systems, most notably in one spatial dimension where it has been experimentally observed. Our results are obtained for the Ising spin chain with transverse and longitudinal magnetic field, but the proposed mechanism is of general validity since it is based on the sole concept of confinement and it should be easily observed in cold atom experiments.

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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