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arXiv 1806.08145cond-mat.str-el
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量子kagome冰中隧道诱导的经典简并恢复

Tunneling-induced restoration of classical degeneracy in quantum kagome ice

Kai-Hsin Wu, Yi-Ping Huang, Ying-Jer Kao

摘要:

量子效应被认为是决定物理系统在低温下行为的重要因素。对于具有几何阻挫的量子磁体,量子涨落通常会提升宏观经典简并度,从而产生奇异的量子态。然而,不同类型的量子过程如何在受限的希尔伯特空间中纠缠波函数还没有得到很好的理解。本文研究了几何阻挫kagome格点上量子冰模型的拓扑纠缠熵和热熵。我们发现,该系统并没有显示出$Z_2$拓扑秩序下降到极低的温度,但继续表现得像一个经典的戈薇冰有限的剩余熵。我们的理论分析表明,一个复杂的竞争的非对角和对角量子过程导致准简并态和有效地,经典简并恢复。

英文摘要:

Quantum effect is expected to dictate the behaviour of physical systems at low temperature. For quantum magnets with geometrical frustration, quantum fluctuation usually lifts the macroscopic classical degeneracy, and exotic quantum states emerge. However, how different types of quantum processes entangle wave functions in a constrained Hilbert space is not well understood. Here, we study the topological entanglement entropy (TEE) and the thermal entropy of a quantum ice model on a geometrically frustrated kagome lattice. We find that the system does not show a $Z_2$ topological order down to extremely low temperature, yet continues to behave like a classical kagome ice with finite residual entropy. Our theoretical analysis indicates an intricate competition of off-diagonal and diagonal quantum processes leading to the quasi-degeneracy of states and effectively, the classical degeneracy is restored.

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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