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arXiv 0810.3788cond-mat.stat-mech
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梯度自旋链中的纠缠

Entanglement in spin chains with gradients

V. Eisler, F. Igloi, I. Peschel

摘要:

我们研究可解的自旋链,其中无论是场或耦合在空间中线性变化,并创建一个类似的基态结构。我们发现两半链之间的纠缠熵随界面宽度的变化呈几何变化。淬火到均匀临界系统后,在XX模型中,熵随时间呈几何增长,但在横向伊辛链中,熵随时间呈二次增长。我们解释了这种行为,并指出其他幂律的推广。

英文摘要:

We study solvable spin chains where either fields or couplings vary linearly in space and create a sandwich-like structure of the ground state. We find that the entanglement entropy between two halves of a chain varies logarithmically with the interface width. After quenching to a homogeneous critical system, the entropy grows logarithmically in time in the XX model, but quadratically in the transverse Ising chain. We explain this behaviour and indicate generalizations to other power laws.

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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