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arXiv 2408.05063cond-mat.str-elcond-mat.stat-mechquant-ph
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一维长程Kitaev模型中的束缚能、纠缠与临界点识别

Bound energy, entanglement and identifying critical points in 1D long-range Kitaev model

Akash Mitra, Shashi C. L. Srivastava

AI总结:

该研究针对长程Kitaev模型,从量子热力学角度分析共形对称性破缺下的纠缠结构,证明束缚能与纠缠熵的线性关系,并发现束缚能极小值可用于识别系统临界点。

摘要:

我们通过量子热力学视角,研究了共形对称性缺失下双分量子系统的纠缠结构。具体而言,我们考察了长程Kitaev模型,其中配对相互作用以指数为$α$的幂律形式衰减,当$α<3/2$时共形对称性破缺。我们通过解析证明,在共形对称性破缺的$α=1$情形下,束缚能这一量子热力学量与单位系统尺寸的纠缠熵平方呈线性正比关系。我们进一步表明,对于所有$α$取值,在热力学极限下束缚能在临界点处呈现显著极小值,这一特性可用于识别$μ=1$的临界点。

英文摘要:

We investigate the entanglement structure of a bipartite quantum system through the lens of quantum thermodynamics in the absence of conformal symmetry. Specifically, we consider the long-range Kitaev model, where the pairing interaction decays as a power law with exponent $α$, with broken conformal symmetry for $α<3/2$. We analytically show that the bound energy, a quantum thermodynamical quantity, is linearly proportional to the square of entanglement entropy per unit system size for $α=1$ where conformal symmetry is broken. We further show that for all values of $α$, bound energy, in the thermodynamic limit, shows a pronounced minimum at the critical point, which enables the identification of $μ=1$.

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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