论文标题
从中子散射特征中发现偶极 - 二八二色量子量型冰冰的脚印
Uncovering footprints of dipolar-octupolar quantum spin ice from neutron scattering signatures
论文作者
论文摘要
CE $ _2 $ zr $ _2 $ o $ _7 $的最新实验表明，该材料可能会设有一种新型的量子旋冰，这是带有新兴光子的三维量子旋转液体。 pseudospin 1/2的自由度描述了pyrochlore晶格上的ce $^{3+} $，其成分随着对称操作下的偶性和八度矩的变化。原则上，根据ISING成分是否在偶极/八极通道中以及出现量规场的两个可能的通量构型，具体存在四个可能的量子自旋冰状状态。在这项工作中，使用精确的对角度和分子动力学，我们使用量子和经典计算研究了所有四个量子自旋冰制度中的相等和动力学自旋结构因子。与四种可能的量子旋转冰块的量子和经典结果的独特签名与量子波动的作用进行了对比，我们表明，针对$π$ -Flux octupolar量子型冰制度计算的量子结构因子与CE $ _2 $ _2 $ zr $ $ _2 $ _2 $ __ $ _______ $ ___ $_______。
Recent experiments on Ce$_2$Zr$_2$O$_7$ suggest that this material may host a novel form of quantum spin ice, a three-dimensional quantum spin liquid with an emergent photon. The Ce$^{3+}$ local moments on the pyrochlore lattice are described by pseudospin 1/2 degrees of freedom, whose components transform as dipolar and octupolar moments under symmetry operations. In principle, there exist four possible quantum spin ice regimes, depending on whether the Ising component is in the dipolar/octupolar channel, and two possible flux configurations of the emergent gauge field. In this work, using exact diagonalization and molecular dynamics, we investigate the equal-time and dynamical spin structure factors in all four quantum spin ice regimes using quantum and classical computations. Contrasting the distinct signatures of quantum and classical results for the four possible quantum spin ice regimes and elucidating the role of quantum fluctuations, we show that the quantum structure factor computed for the $π$-flux octupolar quantum spin ice regime is most compatible with the neutron scattering results on Ce$_2$Zr$_2$O$_7$.
