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arXiv 2302.06743cond-mat.str-elhep-thquant-ph
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长程费米子系统基态中的纠缠熵

Entanglement Entropy in Ground States of Long-Range Fermionic Systems

Debarghya Chakraborty, Nikolaos Angelinos

AI总结:

本文研究一维长程费米子模型基态纠缠熵的标度,发现其受低能理论约束,无序模型在α趋零时呈分形体积律标度。

摘要:

我们研究了一维晶格上多种自由费米子模型基态纠缠熵的标度行为,其中跳跃项和配对项按幂律衰减。我们旨在理解当幂律指数 $\alpha$ 变化时,一般模型中纠缠熵的标度行为。我们询问是否存在一个共同的 $\alpha_{c}$,在不同系统中控制向局域系统中发现的面积律标度的转变。我们通过数值方法探索了几个例子,并论证在适用情况下,长程模型中纠缠熵的标度受低能理论预测的约束。相反,无序模型和没有连续极限的模型在 $\alpha$ 趋近于零时表现出分形标度的纠缠,接近体积律行为。这些一般特征预计在开启相互作用后仍然存在。

英文摘要:

We study the scaling of ground state entanglement entropy of various free fermionic models on one dimensional lattices, where the hopping and pairing terms decay as a power law. We seek to understand the scaling of entanglement entropy in generic models as the exponent of the power law $α$ is varied. We ask if there exists a common $α_{c}$ across different systems governing the transition to area law scaling found in local systems. We explore several examples numerically and argue that when applicable, the scaling of entanglement entropy in long-range models is constrained by predictions from the low-energy theory. In contrast, disordered models and models without a continuum limit show fractal scaling of entanglement approaching volume-law behavior as $α$ approaches zero. These general features are expected to persist on turning on interactions.

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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