Antiferroquadrupolar Order and Rotational Symmetry Breaking in a Generalized Bilinear-Biquadratic Model on a Square Lattice
Antiferroquadrupolar Order and Rotational Symmetry Breaking in a Generalized Bilinear-Biquadratic Model on a Square Lattice
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方格上广义双线性双二次模型中的反铁四极序和旋转对称性破缺
DOI：
10.1103/physrevlett.118.176401
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发表时间：
2017-04-25
影响因子：
8.6
通讯作者：
Si, Qimiao
中科院分区：
文献类型：
--
作者：
Lai, Hsin-Hua;Hu, Wen-Jun;Si, Qimiao
铁硫属化合物的磁性和磁性是近年来人们研究的热点。受体相FeSe的反铁四极和Ising-Err阶的启发，我们研究了具有多邻体相互作用的S = 1广义双线性-双二次模型的相图.我们发现一个大的参数制度（π，0）antiferroquadrupolar相，量子涨落如何稳定它通过提升无限简并的某些半经典状态。无偏密度矩阵重整化群分析也提供了这一C-4-破缺四极相的证据。我们讨论了我们的研究结果的影响FeSe和相关的铁基超导体。
The magnetic and nematic properties of the iron chalcogenides have recently been the subject of intense interest. Motivated by the proposed antiferroquadrupolar and Ising-nematic orders for the bulk FeSe, we study the phase diagram of an S = 1 generalized bilinear-biquadratic model with multineighbor interactions. We find a large parameter regime for a (pi, 0) antiferroquadrupolar phase, showing how quantum fluctuations stabilize it by lifting an infinite degeneracy of certain semiclassical states. Evidence for this C-4-symmetry-breaking quadrupolar phase is also provided by an unbiased density matrix renormalization group analysis. We discuss the implications of our results for FeSe and related iron-based superconductors.