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arXiv quant-ph/0307131quant-phcond-mat.str-el
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XXZ链中的纠缠、量子相变和标度

Entanglement, quantum phase transition and scaling in XXZ chain

Shi-Jian Gu, Hai-Qing Lin, You-Quan Li

摘要:

受量子纠缠最新发展的启发,我们研究了XXZ链的纠缠度$C$,SU $_q$(2)代数,量子相变和零温关联长度之间的关系.我们发现在SU(2)点,基态具有最大的共演。然而,当各向异性参数$Δ$变形时,其值减小。其对$Δ$的依赖性在XY金属相中和在类伊辛绝缘相的临界点(即$1<Δ<1.3$)附近按$C=C_0-C_1(Δ-1)^2$标度。我们还研究了$C$对关联长度$ξ$的依赖性,并证明了在临界点附近它满足$C=C_0-1/2ξ$。对于不同的系统尺寸,我们证明了存在一个关于关联长度$ξ$的普适标度函数$C$.

英文摘要:

Motivated by recent development in quantum entanglement, we study relations among concurrence $C$, SU$_q$(2) algebra, quantum phase transition and correlation length at the zero temperature for the XXZ chain. We find that at the SU(2) point, the ground state possess the maximum concurrence. When the anisotropic parameter $Δ$ is deformed, however, its value decreases. Its dependence on $Δ$ scales as $C=C_0-C_1(Δ-1)^2$ in the XY metallic phase and near the critical point (i.e. $1<Δ<1.3$) of the Ising-like insulating phase. We also study the dependence of $C$ on the correlation length $ξ$, and show that it satisfies $C=C_0-1/2ξ$ near the critical point. For different size of the system, we show that there exists a universal scaling function of $C$ with respect to the correlation length $ξ$.

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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