Chain-based order and quantum spin liquids in dipolar spin ice
Chain-based order and quantum spin liquids in dipolar spin ice
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偶极自旋冰中基于链的有序和量子自旋液体
DOI：
10.1103/physrevb.92.094418
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发表时间：
2015
影响因子：
3.7
通讯作者：
McClarty P
中科院分区：
文献类型：
--
作者：
McClarty P
最近对自旋冰材料的实验表明，鲍林“冰熵”（其经典库仑自旋液体状态的特征）可能在低温下消失[Pomaranski，Nat。物理。 9、353(2013)1745-247310.1038/nphys2591]。然而，尽管经过近二十年的深入研究，自旋冰平衡基态的性质仍然不确定。在这里，我们探索长程偶极相互作用、短程交换相互作用和量子涨落如何结合起来确定偶极自旋冰的基态。我们确定了从一组“链态”中选择有序基态的组织原则，其中偶极相互作用呈指数筛选。使用量子和经典蒙特卡罗模拟，我们建立了作为量子隧道效应和温度函数的相图，并发现只需要非常小的量就可以稳定量子自旋液体基态。我们讨论这些结果的含义。
Recent experiments on the spin-ice materialsuggest that the Pauling “ice entropy,” characteristic of its classical Coulombic spin-liquid state, may be lost at low temperatures [Pomaranski , Nat. Phys. 9, 353 (2013)1745-247310.1038/nphys2591]. However, despite nearly two decades of intensive study, the nature of the equilibrium ground state of spin ice remains uncertain. Here we explore how long-range dipolar interactions, short-range exchange interactions, and quantum fluctuations combine to determine the ground state of dipolar spin ice. We identify the organizational principle that ordered ground states are selected from a set of “chain states” in which dipolar interactions are exponentially screened. Using both quantum and classical Monte Carlo simulation, we establish phase diagrams as a function of quantum tunnelingand temperature, and find that only a very smallis needed to stabilize a quantum spin liquid ground state. We discuss the implications of these results for.