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Scaling of Geometric Quantum Discord Close to a Topological Phase Transition

机译:接近拓扑相变的几何量子不和谐标度

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摘要

Quantum phase transition is one of the most interesting aspects in quantum many-body systems. Recently, geometric quantum discord has been introduced to signature the critical behavior of various quantum systems. However, it is well-known that topological quantum phase transition can not be described by the conventional Landau's symmetry breaking theory, and thus it is unknown that whether previous study can be applicable in this case. Here, we study the topological quantum phase transition in Kitaev's 1D p-wave spinless quantum wire model in terms of its ground state geometric quantum discord. The derivative of geometric quantum discord is nonanalytic at the critical point, in both zero temperature and finite temperature cases. The scaling behavior and the universality are verified numerically. Therefore, our results clearly show that all the key ingredients of the topological phase transition can be captured by the nearest neighbor and long-range geometric quantum discord.
机译:量子相变是量子多体系统中最有趣的方面之一。最近,引入了几何量子矛盾以签名各种量子系统的临界行为。然而,众所周知,拓扑量子相变不能用常规的Landau对称性破坏理论来描述,因此尚不清楚先前的研究是否可以适用于这种情况。在这里,我们从基塔耶夫的一维p波无旋量子线模型的基态几何量子失调角度研究拓扑量子相变。在零温度和有限温度的情况下,几何量子失调的导数在临界点都是非解析的。通过数值验证了缩放行为和通用性。因此,我们的结果清楚地表明,拓扑相变的所有关键要素都可以被最近的邻居和远距离几何量子失调所捕获。

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