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arXiv quant-ph/0407228quant-ph
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低维自旋系统中的纠缠与量子相变

Entanglement and Quantum Phase Transition in Low Dimensional Spin Systems

Yan Chen, Paolo Zanardi, Z. D. Wang, F. C. Zhang

摘要:

利用自旋-自旋并发和自旋子晶格与系统其余部分之间的纠缠熵,分析了$XXZ$和二聚海森堡自旋链以及两条腿自旋梯中基态的纠缠.特别是,我们发现,量子相变点/边界可以确定的基础上的本地极端的分析,这纠缠熵,这是说明优于并发的情况下,可以使我们能够探索量子相变在许多其他系统,包括高维的。

英文摘要:

Entanglement of the ground states in $XXZ$ and dimerized Heisenberg spin chains as well as in a two-leg spin ladder is analyzed by using the spin-spin concurrence and the entanglement entropy between a selected sublattice of spins and the rest of the system. In particular, we reveal that quantum phase transition points/boundaries may be identified based on the analysis on the local extreme of this entanglement entropy, which is illustrated to be superior over the concurrence scenario and may enable us to explore quantum phase transitions in many other systems including higher dimensional ones.

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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