论文标题
rucl $ _3 $中的非基塔夫术语和分数粒子的范围
The range of non-Kitaev terms and fractional particles in RuCl$_3$
论文作者
论文摘要
重大的努力集中在相对论莫特绝缘子的磁激发上，预计将实现Kitaev量子自旋液体（QSL）。这种确切的可解决模型涉及由键依赖性的ISID相互作用产生的高度纠缠状态，这些相互作用产生了旋转挡板而非本地的激发。实际材料中的一个关键挑战是确定非基塔夫术语的相对大小及其在分数激发的出现或抑制中的作用。在这里，我们通过将RUCL3与量子蒙特卡洛（QMC）的结果直接比较Kitaev QSL的结果直接比较非基塔EV相互作用的能量和温度边界。此外，我们进一步证实了磁激发的分数性质，这是通过创建一对费米子准颗粒给出的。有趣的是，这种费米子响应在非基塔夫范围内仍然有效。我们的结果和关注拉曼敏感性的使用为QSL的未来理论和实验研究提供了严格的新测试。
Significant efforts have focused on the magnetic excitations of relativistic Mott insulators, predicted to realize the Kitaev quantum spin liquid (QSL). This exactly solvable model involves a highly entangled state resulting from bond-dependent Ising interactions that produce excitations which are non-local in terms of spin flips. A key challenge in real materials is identifying the relative size of the non-Kitaev terms and their role in the emergence or suppression of fractional excitations. Here, we identify the energy and temperature boundaries of non-Kitaev interactions by direct comparison of the Raman susceptibility of RuCl3 with quantum Monte Carlo (QMC) results for the Kitaev QSLs. Moreover, we further confirm the fractional nature of the magnetic excitations, which is given by creating a pair of fermionic quasiparticles. Interestingly, this fermionic response remains valid in the non-Kitaev range. Our results and focus on the use of the Raman susceptibility provide a stringent new test for future theoretical and experimental studies of QSLs.
