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arXiv 2104.00692cond-mat.stat-mechcond-mat.dis-nncond-mat.str-el
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Hilbert空间破碎模型中的信息动力学

Information Dynamics in a Model with Hilbert Space Fragmentation

Dominik Hahn, Paul A. McClarty, David J. Luitz

摘要:

全阻挫阶梯--一个准一维几何阻挫自旋一半海森堡模型--在阶梯的梯级上与局部守恒量不可积,导致希尔伯特空间分裂成梯级上由单线态和三线态组成的扇区。我们通过纠缠熵和超时有序子(OTOC)研究了该模型的远离平衡态的动力学行为。后淬火动力学的纠缠熵是高度异常的,因为它显示出明确的非阻尼复苏,出现从短连接的三重态块,其持久性,因此是一个后果的碎裂。我们发现,熵的最大值如下从一个图片中,不同的片段之间的凝聚力与完美的热化内每个片段共存。这意味着本征态热化假设在所有足够大的希尔伯特空间碎片中都成立。OTOC显示短距离振荡所产生的短耦合片段,这成为在较长的距离,和亚弹道传播和长距离的指数衰减所产生的紧急长度尺度绑定到碎裂。

英文摘要:

The fully frustrated ladder - a quasi-1D geometrically frustrated spin one half Heisenberg model - is non-integrable with local conserved quantities on rungs of the ladder, inducing the fragmentation of the Hilbert space into sectors composed of singlets and triplets on rungs. We explore the far-from-equilibrium dynamics of this model through the entanglement entropy and out-of-time-ordered correlators (OTOC). The post-quench dynamics of the entanglement entropy is highly anomalous as it shows clear non-damped revivals that emerge from short connected chunks of triplets and whose persistence is therefore a consequence of fragmentation. We find that the maximum value of the entropy follows from a picture where coherences between different fragments co-exist with perfect thermalization within each fragment. This means that the eigenstate thermalization hypothesis holds within all sufficiently large Hilbert space fragments. The OTOC shows short distance oscillations arising from short coupled fragments, which become decoherent at longer distances, and a sub-ballistic spreading and long distance exponential decay stemming from an emergent length scale tied to fragmentation.

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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