Evidence of Magnon-Mediated Orbital Magnetism in a Quasi-2D Topological Magnon Insulator,Nano Letters

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Evidence of Magnon-Mediated Orbital Magnetism in a Quasi-2D Topological Magnon Insulator
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-14 , DOI: 10.1021/acs.nanolett.2c00562
Laith Alahmed ₁ , Xiaoqian Zhang ₂ , Jiajia Wen ₃ , Yuzan Xiong ₄ , Yi Li ₅ , Li-Chuan Zhang ₆ , Fabian Lux ₇ , Frank Freimuth _{6,

7} , Muntasir Mahdi ₁ , Yuriy Mokrousov _{6,

7} , Valentine Novosad ₅ , Wai-Kwong Kwok ₅ , Dapeng Yu ₂ , Wei Zhang _{8,

9} , Young S Lee _{3,

10} , Peng Li ₁

Affiliation

Department of Electrical and Computer Engineering, Auburn University, Auburn, Alabama 36849, United States.
Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.
Department of Electrical and Computer Engineering, Oakland University, Rochester, Michigan 48309 United States.
Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.
Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany.
Department of Physics, Oakland University, Rochester, Michigan 48309 United States.
Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.
Department of Applied Physics, Stanford University, Stanford, California 94305, United States.

We explore spin dynamics in Cu(1,3-bdc), a quasi-2D topological magnon insulator. The results show that the thermal evolution of the Landé g factor (g) is anisotropic: g_in-plane decreases while g_out-of-plane increases with increasing temperature T. Moreover, the anisotropy of the g factor (Δg) and the anisotropy of saturation magnetization (ΔM_s) are correlated below 4 K, but they diverge above 4 K. We show that the electronic orbital moment contributes to the g anisotropy at lower T, while the topological orbital moment induced by thermally excited spin chirality dictates the g anisotropy at higher T. Our work suggests an interplay among topology, spin chirality, and orbital magnetism in Cu(1,3-bdc).

中文翻译：

准二维拓扑磁子绝缘体中磁子介导轨道磁性的证据

我们探索了准二维拓扑磁子绝缘体 Cu(1,3-bdc) 中的自旋动力学。结果表明，Landé g因子 ( g ) 的热演化是各向异性的：随着温度T的增加， g_面内减小，而_面外g增加。此外，g因子的各向异性 (Δ g ) 和饱和磁化强度的各向异性 (Δ M _s ) 在 4 K 以下是相关的，但它们在 4 K 以上发散。我们表明电子轨道矩有助于g各向异性在较低吨，而由热激发自旋手性引起的拓扑轨道矩决定了较高T下的g各向异性。我们的工作表明 Cu(1,3-bdc) 的拓扑结构、自旋手性和轨道磁性之间存在相互作用。

更新日期：2022-06-14

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