Tseng Yi, Paris Eugenio, Schmidt Kai P, Zhang Wenliang, Asmara Teguh Citra, Bag Rabindranath, Strocov Vladimir N, Singh Surjeet, Schlappa Justine, Rønnow Henrik M, Schmitt Thorsten
Photon Science Division, Paul Scherrer Institut, Forschungstrasse 111, CH-5232 Villigen PSI, Switzerland.
Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
Commun Phys. 2023;6(1):138. doi: 10.1038/s42005-023-01250-9. Epub 2023 Jun 12.
Studying multi-particle elementary excitations has provided unique access to understand collective many-body phenomena in correlated electronic materials, paving the way towards constructing microscopic models. In this work, we perform O -edge resonant inelastic X-ray scattering (RIXS) on the quasi-one-dimensional cuprate with weakly-doped spin ladders. The RIXS signal is dominated by a dispersing sharp mode ~ 270 meV on top of a damped incoherent component ~ 400-500 meV. Comparing with model calculations using the perturbative continuous unitary transformations method, the two components resemble the spin-conserving = 0 two-triplon bound state and continuum excitations in the spin ladders. Such multi-spin response with long-lived = 0 excitons is central to several exotic magnetic properties featuring Majorana fermions, yet remains unexplored given the generally weak cross-section with other experimental techniques. By investigating a simple spin-ladder model system, our study provides valuable insight into low-dimensional quantum magnetism.
对多粒子元激发的研究为理解关联电子材料中的集体多体现象提供了独特途径，为构建微观模型铺平了道路。在这项工作中，我们对准一维弱掺杂自旋梯子状铜酸盐进行了O边共振非弹性X射线散射（RIXS）。RIXS信号主要由一个位于约400 - 500毫电子伏特的衰减非相干分量之上的约270毫电子伏特的色散尖锐模主导。与使用微扰连续幺正变换方法的模型计算结果相比，这两个分量类似于自旋守恒的S = 0双三重子束缚态以及自旋梯子中的连续激发。这种具有长寿命S = 0激子的多自旋响应是具有马约拉纳费米子的几种奇异磁性特性的核心，但鉴于与其他实验技术的截面通常较弱，尚未得到探索。通过研究一个简单的自旋梯子模型系统，我们的研究为低维量子磁性提供了有价值的见解。
