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arXiv 1803.09528cond-mat.stat-mechcond-mat.str-el
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有限温度下具有长程超导配对的一维Kitaev链的拓扑足迹

Topological footprints of the 1D Kitaev chain with long range superconducting pairings at a finite temperature

Utso Bhattacharya, Amit Dutta

摘要:

我们研究了一维Kitaev链与长程配对项在一个有限的温度下,该系统是准备在一个混合状态的平衡与热库保持在一个恒定的温度$T$。为了探测有限温度下模型的基态拓扑行为的足迹,我们研究了从两种几何结构中提取的两个全局量:Uhlmann和干涉相位。有趣的是,当长程效应占主导地位时,乌尔曼相位方法无法在纯态极限下再现模型的拓扑方面;另一方面,干涉相位虽然具有适当的纯态还原,但表现出与环境温度无关的行为。

英文摘要:

We study the 1D Kitaev chain with long range superconductive pairing terms at a finite temperature where the system is prepared in a mixed state in equilibrium with a heat reservoir maintained at a constant temperature $T$. In order to probe the footprint of the ground state topological behavior of the model at finite temperature, we look at two global quantities extracted out of two geometrical constructions: the Uhlmann and the interferometric phase. Interestingly, when the long-range effect dominates, the Uhlmann phase approach fails to reproduce the topological aspects of the model in the pure state limit; on the other hand, the interferometric phase, though has a proper pure state reduction, shows a behaviour independent of the ambient 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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