论文标题
通过反常的拉曼散射探测候选量子自旋液体CU2IRO3中分数化的特征
Probing signatures of fractionalization in candidate quantum spin liquid Cu2IrO3 via anomalous Raman scattering
论文作者
论文摘要
量子自旋液体（QSL）中的远距离纠缠导致新型的低能激励，并具有分数化的量子数和（以2D）统计。对这些激发的实验检测和操纵，尤其是鉴于各种候选磁铁的挑战。分数化的有希望的探测是它们与声子耦合。在这里，我们提出了S = 1/2 Honeycomb Iriate Cu2iro3的拉曼散射结果，这是一种候选的Kitaev QSL，具有分数化的Majorana Fermions和Ising Flux激发。我们观察到反常的低温频移和拉曼强度的线宽扩大，除了宽阔的磁连续性，我们得出的这两个磁连续性都自然归因于声子衰减到巡回的majortianta。动态拉曼的敏感性标志着〜120 k处的QSL到热paramagnet的交叉。该温度以下的声子异常表明了强烈的声子 - 马霍拉纳耦合。这些结果提供了CU2IRO3中自旋分数化的证据。
Long-range entanglement in quantum spin liquids (QSLs) lead to novel low energy excitations with fractionalised quantum numbers and (in 2D) statistics. Experimental detection and manipulation of these excitations present a challenge particularly in view of diverse candidate magnets. A promising probe of fractionalisation is their coupling to phonons. Here we present Raman scattering results for the S = 1/2 honeycomb iridate Cu2IrO3, a candidate Kitaev QSL with fractionalised Majorana fermions and Ising flux excitations. We observe anomalous low temperature frequency shift and linewidth broadening of the Raman intensities in addition to a broad magnetic continuum both of which, we derive, are naturally attributed to the phonon decaying into itinerant Majoranas. The dynamic Raman susceptibility marks a crossover from the QSL to a thermal paramagnet at ~120 K. The phonon anomalies below this temperature demonstrate a strong phonon-Majorana coupling. These results provide for evidence of spin fractionalisation in Cu2IrO3.
