论文标题
观察自旋1/2蜂窝晶格中的斑块波动
Observation of plaquette fluctuations in the spin-1/2 honeycomb lattice
论文作者
论文摘要
量子自旋液体是具有量子纠缠的自旋相关性并避免在t = 0 k处的磁性长距离顺序的材料。特别有趣的是二维蜂窝旋转晶格，预测有很多异国情调的量子自旋液体。在这里，我们通过实验研究了有效的S = 1/2 Heisenberg Honeycomb晶格，与最接近和下一个最新的邻居相互作用进行了竞争。我们证明YBBR $ _3 $避免订购至少t = 100 mk，并具有动态的自旋旋转相关函数，且宽阔的连续散射典型的量子旋转液体在量子临界点附近的典型。自旋光谱中的连续体与理论预测的斑块类型波动一致。我们的研究是一个实验证明，即使在没有基塔夫型相互作用的情况下，蜂窝晶格也可能存在强量子波动，并对量子自旋液体开辟了新的视角。
Quantum spin liquids are materials that feature quantum entangled spin correlations and avoid magnetic long-range order at T = 0 K. Particularly interesting are two-dimensional honeycomb spin lattices where a plethora of exotic quantum spin liquids have been predicted. Here, we experimentally study an effective S=1/2 Heisenberg honeycomb lattice with competing nearest and next-nearest neighbor interactions. We demonstrate that YbBr$_3$ avoids order down to at least T=100 mK and features a dynamic spin-spin correlation function with broad continuum scattering typical of quantum spin liquids near a quantum critical point. The continuum in the spin spectrum is consistent with plaquette type fluctuations predicted by theory. Our study is the experimental demonstration that strong quantum fluctuations can exist on the honeycomb lattice even in the absence of Kitaev-type interactions, and opens a new perspective on quantum spin liquids.
