论文标题
观察Ising链反铁磁铁中的E8颗粒
Observation of E8 Particles in an Ising Chain Antiferromagnet
论文作者
论文摘要
在Ising链的横向场诱导的量子临界点附近，预测由恰好由八个颗粒组成的外来动态频谱被预测，这是由$ e_8 $ lie代数的对称性的出现量子集成场理论独特地描述的，但很少经过实验探索。在这里，我们使用高分辨率的Terahertz光谱来解决准二维ISINID ISINIS ANTANTINID ISINIM SPIN动力学，抗FiferRomagnet Baco $ _2 $ v $ _2 $ _2 $ o $ $ _8 $在应用的横向场中。通过与动态自旋相关性的分析计算进行比较，我们确定了$ e_8 $颗粒及其两粒子激发。
Near the transverse-field induced quantum critical point of the Ising chain, an exotic dynamic spectrum consisting of exactly eight particles was predicted, which is uniquely described by an emergent quantum integrable field theory with the symmetry of the $E_8$ Lie algebra, but rarely explored experimentally. Here we use high-resolution terahertz spectroscopy to resolve quantum spin dynamics of the quasi-one-dimensional Ising antiferromagnet BaCo$_2$V$_2$O$_8$ in an applied transverse field. By comparing to an analytical calculation of the dynamical spin correlations, we identify $E_8$ particles as well as their two-particle excitations.
