Is there a pure quantum spin liquid?
Is there a pure quantum spin liquid?
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DOI：
10.1016/j.xinn.2023.100484
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发表时间：
2023-09-11
期刊：
影响因子：
32.1
通讯作者：
Ma, Jie
中科院分区：
文献类型：
--
作者：
Lin, Gaoting;Ma, Jie
自旋液体是一种奇特的材料，在任何小于自旋相互作用的有限温度下，由于波动而不存在磁序。它们的发生是由于高度的基态简并。万尼尔在1950年表明，如此大的基态简并理论上可以发生在二维（2D）的伊辛自旋三角形晶格中，这是一种经典的几何受挫晶格模式。到目前为止，几何受挫晶格已经形成了一个大的体系家族：边缘共享三角形作为三角形晶格，角共享三角形作为二维体系中的kagom<e:1>晶格，角共享四面体作为三维体系中的焦氯盐晶格等。1-3实现真正的自旋液体材料一直是凝聚态物理中的巨大挑战之一。自旋涨落可以是经典涨落，也可以是量子涨落。由于磁几何挫折，自旋顺序被热波动所阻止。如果不考虑量子涨落，理论上可以得到经典的自旋液体基态。当自旋液体的相变和自发对称性破缺超出常规朗道范式时，拓扑凝聚态物理成为描述具有长程纠缠相和拓扑序的自旋液体基态的重要理论基础。这样的原型可以通过一个磁性较小的受挫晶格来实现，其磁性可与1/2相比，这更可能发生在高度的基态简并和强量子涨落中。远程纠缠可以出现并产生量子自旋液体（QSL）基态。半个世纪前，1973年，Philip Anderson在自旋为1/2的三角形晶格反铁磁最近邻海森堡模型（图1a）中引入了共振价键的定义，该模型被认为是术语“QSL”的最早原型。尽管这种状态最终被证明是有问题的，但是在实现QSL阶段的挫折效应已经引起了极大的关注。1987年，高温超导性的发现导致了qsl的复兴，这种复兴一直持续到今天。到目前为止，拓扑相仍然是理解QSL基态的最深入和最好的例子，并且该主题正在稳步发展。然而，由于材料制备、本征行为测试和理论方法的限制，对qsl进行清晰的实验观察仍然面临着重大挑战。理论预测表明，接近金属-绝缘体转变的“弱”莫特绝缘体具有实现QSL相的巨大潜力。1 - 3
Spin liquids are exotic materials where the magnetic order is absent due to fluctuations at any finite temperature less than the spin interaction. Their occurrence is attributed to a high degree of ground state degeneracy. Wannier showed in 1950 that such a large degeneracy of ground state can theoretically take place in a two-dimensional (2D) triangular lattice with Ising spins, a classically geometrical frustrated lattice mode. So far, the geometrically frustrated lattice has a large family of systems: edge-shared triangles as a triangular lattice and corner-shared triangles as a kagomé lattice in a 2D system and corner-sharing tetrahedra as a pyrochlore lattice in a three-dimensional system, etc. 1–3 The realization of a real spin-liquid material has been one of the great challenges in condensed matter physics. Spin fluctuations can be both classical and quantum in the spin liquids. 1 Due to the magnetically geometrical frustration, spin order is prevented by thermal fluctuations. If the quantum fluctuation is not included, a classical spin liquid ground state should be obtained theoretically. When the spin liquids are beyond the conventional Landau paradigm for phase transitions and spontaneous symmetry breaking, the topological condensed matter physics becomes an important theoretical basis of describing the spin liquid ground state with long-range entangled phases and topological orders. Such a prototype may be implemented by a frustrated lattice with smaller magnetism comparable to 1/2 that is more likely to occur with the high degree of ground state degeneracy and strong quantum fluctuations. Long-range entanglement can appear and give rise to a quantum spin liquid (QSL) ground state.Half a century ago, in 1973, Philip Anderson introduced the definition of resonating valence bond in the spin-1/2 triangular lattice antiferromagnetic nearestneighbor Heisenberg model, Figure 1 A, which is considered the earliest prototype of the term “QSL.” Although such a state ultimately proved to be questionable, the frustration effect in achieving QSL phases has attracted tremendous attention. 1 In 1987, the discovery of high-temperature superconductivity led to a revival of QSLs that continues today. Thus far, topological phases remain the most indepth and best examples of understanding the QSL ground state, and the subject is steadily evolving. However, a clear experimental observation of QSLs still faces significant challenges owing to the limitations from material preparation, intrinsic-behavior testing, and theoretical methods. The theoretical prediction suggests that “weak” Mott insulators, approaching the metal-insulator transition, have great potential to achieve QSL phases. 1–3
影响因子：
32.1
作者：
Zhu, Zihao;Pan, Binglin;Nie, Linpeng;Ni, Jiamin;Yang, Yanxing;Chen, Changsheng;Jiang, Chengyu;Huang, Yeyu;Cheng, Erjian;Yu, Yunjie;Miao, Jianjian;Hillier, Adrian D.;Chen, Xianhui;Wu, Tao;Zhou, Yi;Li, Shiyan;Shu, Lei
通讯作者：
Shu, Lei
量子自旋液体候选物 NaYbSe2 中的晶体电场激发
影响因子：
3.7
作者：
Zhang, Zheng;Ma, Xiaoli;Zhang, Qingming
通讯作者：
Zhang, Qingming