论文标题
SPIN-1/2三角形抗fiferromagnet csybse $ _2 $的完整场引起的光谱响应
Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe$_2$
论文作者
论文摘要
在安德森（Anderson）的共鸣价键提案后五十年，旋转1/2三角形静态海森堡抗铁磁铁（TLHAF）仍然是探索高度纠缠的量子旋转状态在与磁性顺序附近的高度纠缠量子旋转状态的最终平台。基于YB的Delafossites是理想的候选TLHAF材料，可实验到全面施加的平面磁场。我们对CSYBSE $ _2 $进行系统的中子散射研究，首先证明了相互作用的Heisenberg特征并量化了第二个邻近耦合。然后，我们测量激发光谱的复杂演化，在整个1/3-Magnetization Plateau中找到120 $^{\ circ} $订购状态附近的广泛的连续性特征，并在此之前到达饱和。我们执行圆柱基质产物状态（MPS）计算，以获得TLHAF的无偏数基准，并与实验光谱达成壮观的一致性。测得的和计算出的纵向光谱函数反映了多麦克农结合状态和散射状态的作用。这些结果为沮丧的量子材料中非常规场引起的旋转激发提供了宝贵的见解。
Fifty years after Anderson's resonating valence-bond proposal, the spin-1/2 triangular-lattice Heisenberg antiferromagnet (TLHAF) remains the ultimate platform to explore highly entangled quantum spin states in proximity to magnetic order. Yb-based delafossites are ideal candidate TLHAF materials, which allow experimental access to the full range of applied in-plane magnetic fields. We perform a systematic neutron scattering study of CsYbSe$_2$, first proving the Heisenberg character of the interactions and quantifying the second-neighbour coupling. We then measure the complex evolution of the excitation spectrum, finding extensive continuum features near the 120$^{\circ}$-ordered state, throughout the 1/3-magnetization plateau and beyond this up to saturation. We perform cylinder matrix-product-state (MPS) calculations to obtain an unbiased numerical benchmark for the TLHAF and spectacular agreement with the experimental spectra. The measured and calculated longitudinal spectral functions reflect the role of multi-magnon bound and scattering states. These results provide valuable insight into unconventional field-induced spin excitations in frustrated quantum materials.
