论文标题
$ e_8 $ quasi-One维抗Fiferromagnet Baco $ _2 $ v $ _2 $ o $ $ _8 $
$E_8$ Spectra of Quasi-one-dimensional Antiferromagnet BaCo$_2$V$_2$O$_8$ under Transverse Field
论文作者
论文摘要
我们报告$^{51} $ V核磁共振（NMR）和非弹性中子散射（INS）测量在沿[010]方向的横向场下方的横向场下方的Antyromagnet Baco $ _2 $ _2 $ _2 $ _2 $ _2 $ _8 $上进行。 Néel温度上方的自旋晶格松弛率的缩放行为在$ H_C^{1D} \大约4.7 $ t上公布了1D量子临界点（QCP），该量子被3D磁性顺序掩盖。借助准确的分析分析和数值计算，我们表明，$ H_C^{1D} $处的区域中心INS频谱由磁场中的1D量子ISING模型的模式精确地描述，这是磁场中的一类普遍性，以异常的$ e_8 $ lie algebra描述。当系统远离1D QCP时，这些激发在某个场地范围内一直是非排除的。我们的结果提供了化合物中大量$ e_8 $相的明确实验实现，并开放了新的实验途径，以探索量子整合系统的动力学以及超出整合性的物理。
We report $^{51}$V nuclear magnetic resonance (NMR) and inelastic neutron scattering (INS) measurements on a quasi-1D antiferromagnet BaCo$_2$V$_2$O$_8$ under transverse field along the [010] direction. The scaling behavior of the spin-lattice relaxation rate above the Néel temperatures unveils a 1D quantum critical point (QCP) at $H_c^{1D}\approx 4.7$ T, which is masked by the 3D magnetic order. With the aid of accurate analytical analysis and numerical calculations, we show that the zone center INS spectrum at $H_c^{1D}$ is precisely described by the pattern of the 1D quantum Ising model in a magnetic field, a class of universality described in terms of the exceptional $E_8$ Lie algebra. These excitations keep to be non-diffusive over a certain field range when the system is away from the 1D QCP. Our results provide an unambiguous experimental realization of the massive $E_8$ phase in the compound, and open new experimental route for exploring the dynamics of quantum integrable systems as well as physics beyond integrability.
