AI 中文总结
研究通过扰动临界横向场伊辛链，在准二维量子磁体\(Cu_2(OH)_3Br\)中观察接近维度约化的特征质量谱，为\(E_8\)对称性及相关激发提供证据，证明可积场论对凝聚态多体量子临界现象的描述能力。
AI 中文摘要
通过适当扰动临界横向场伊辛链使其偏离临界点，系统可发展出具有特征纯质量谱的有限关联长度，其比率和关联由可积场论及对应于\(E_8\)李代数的无穷组运动积分精确描述。本文报道了在准二维量子磁体\(Cu_2(OH)_3Br\)中接近横向场诱导维度约化的特征质量谱的实验观察，为涌现的\(E_8\)对称性及铁磁链亚晶格中束缚态的相应激发提供了证据。这些结果证明了可积场论在描述凝聚态系统中涌现的多体量子临界现象方面的能力。
英文摘要
By appropriately perturbing a critical transverse-field Ising chain away from its critical point, the system can develop a finite correlation length with a characteristic purely massive spectrum, whose ratios and correlations are precisely described by an integrable field theory and an infinite set of integrals of motion corresponding to the $E_8$ Lie algebra. In this work, we report on experimental observation of a characteristic massive spectrum close to transverse field-induced dimensional reduction in a quasi-two-dimensional quantum magnet Cu$_2$(OH)$_3$Br, providing evidence for an emergent $E_8$ symmetry and the corresponding excitations of bound states in the sublattice of its ferromagnetic chains. These results demonstrate the power of integrable field theory in describing emergent many-body quantum critical phenomena in condensed matter systems.
Comments6 pages, 4 figures
