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arXiv 1012.4270quant-phcond-mat.stat-mech
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基态分解和对称性破缺关联

Ground state factorization and correlations with broken symmetry

Bruno Tomasello, Davide Rossini, Alioscia Hamma, Luigi Amico

摘要:

我们证明了量子多体系统中的因子分解现象是如何具有集体性质的。为此,我们研究了横向场中一维XY模型中的量子不协调$Q$。我们分析了$Q$在临界点和非临界分解域上的行为。的因式分解被发现是由一个指数标度律为$Q$。我们还解决了热效应从零温度下发生的异常扇出。接近量子相变,$Q$表现出有限温度交叉与普遍的标度行为,而因式分解现象的结果在一个非平凡的模式的相关性存在于低温。

英文摘要:

We show how the phenomenon of factorization in a quantum many body system is of collective nature. To this aim we study the quantum discord $Q$ in the one dimensional XY model in a transverse field. We analyze the behavior of $Q$ at both the critical point and at the non critical factorizing field. The factorization is found to be governed by an exponential scaling law for $Q$. We also address the thermal effects fanning out from the anomalies occurring at zero temperature. Close to the quantum phase transition, $Q$ exhibits a finite-temperature crossover with universal scaling behavior, while the factorization phenomenon results in a non trivial pattern of correlations present at low temperature.

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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