我们应用含时密度泛函理论计算了bcc-Cr和Cr $_2$ O $_3$的横向磁化率，它们分别构成了具有巡回和局域磁矩的反铁磁体的典型例子。交换相关核被重新缩放，以执行戈德斯通条件和磁振子色散关系的基础上提取的对称性分析依赖于广义Onsager关系。这样做，我们的计算产生的特征线性磁振子色散的反铁磁体在长波长的限制。在Cr $_2$ O $_3$的情况下，我们发现，绝热局域密度近似产生一个很好的定性与测量的色散协议，但高估的磁振子速度和带宽的一个因素。包括哈伯德修正提高了磁振子的速度，但在与实验磁振子色散的整体定性协议的代价。对于体心立方铬，我们发现一个尖锐的声学磁振子模式在低能量与以前报道的值一致的速度。在较高的能量下，声磁振子模式变得受到强烈的朗道阻尼，一旦进入Stoner连续谱就迅速消失。除了声磁振子模式，我们还观察到一个额外的集体模式沿$Γ\rightarrow\mathrm{R}$方向的能量为$\sim$ 1 eV，这是位于内部的斯通纳连续，但似乎逃避朗道阻尼的效果。
英文摘要：
We apply time-dependent density functional theory to calculate the transverse magnetic susceptibility of bcc-Cr and Cr$_2$O$_3$, which constitute prototypical examples of antiferromagnets with itinerant and localized magnetic moments respectively. The exchange-correlation kernel is rescaled in order to enforce the Goldstone condition and the magnon dispersion relations are extracted based on a symmetry analysis relying on the generalized Onsager relation. Doing so, our calculations yield the characteristic linear magnon dispersion of antiferromagnets in the long wavelength limit. In the case of Cr$_2$O$_3$, we find that the adiabatic local density approximation yields a good qualitative agreement with the measured dispersion, but overestimates the magnon velocity and bandwidth by a factor of two. Including a Hubbard correction improves the magnon velocity, but at the expense of the overall qualitative agreement with the experimental magnon dispersion. For bcc-Cr we find a sharp acoustic magnon mode at low energies with a velocity in agreement with previously reported values. At higher energies, the acoustic magnon mode becomes subject to strong Landau damping and rapidly vanishes once it enters the Stoner continuum. In addition to the acoustic magnon mode, we also observe an additional collective mode along the $Γ\rightarrow\mathrm{R}$ direction with an energy of $\sim$ 1 eV, which is located inside the Stoner continuum, but appears to elude the effect of Landau damping.
Exchange Interactions and Magnon Spectra in bcc Fe(001) Thin Films: A Computational Study
Uppsala University（乌普萨拉大学）；Institute of Molecular Physics, Polish Academy of Sciences（波兰科学院分子物理研究所）；Poznań University of Technology（波兹南理工大学）；Universidad Nacional Autónoma de México（墨西哥国立自治大学）
Unidirectional magnetoresistance driven by nonequilibrium antiferromagnetic magnons
South China University of Technology（华南理工大学）；Norwegian University of Science and Technology（挪威科技大学）；Peking University（北京大学）；Nanyang Technological University（南洋理工大学）
Exceptional sign changes of the non-local spin Seebeck effect in antiferromagnetic hematite
基于纯磁振子自旋电流在反铁磁绝缘体材料中传播的低功率自旋电子器件提供了优于铁磁组件的几个明显优点，包括更高频率的磁振子和抗干扰外部磁场的稳定性。在这项工作中，我们利用铁氧化物的绝缘反铁磁相，赤铁矿$α$ -Fe $_2$ O $_3$来研究热产生的磁振子自旋电流的长距离输运。我们报告的自旋Seebeck效应产生的磁振子的激发，平行和垂直于反铁磁易轴下施加的磁场运输。利用原子的赤铁矿玩具模型，我们计算了输运特性的反铁磁有序的偏离平衡下施加的电场。我们解决的作用的磁序参量的运输，实验中，我们发现显着的热自旋运输，而不需要一个净磁化。
Finite-Momentum Antiferromagnetic Magnon Dynamics across the Morin Transition in Hematite
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University（南京大学固体微结构物理国家重点实验室和物理学院）；Jiangsu Physical Science Research Center, Nanjing University（南京大学江苏物理科学研究中心）
Observation of Dyakonov-Perel-type magnon spin relaxation in uniaxial antiferromagnetic insulators
Southern University of Science and Technology（南方科技大学）；Quantum Science Center of Guangdong–Hong Kong–Macao Greater Bay Area (Guangdong)（粤港澳大湾区量子科学中心（广东））；Beijing Normal University（北京师范大学）；Fudan University（复旦大学）
Electric-Switchable Chiral Magnons in PT-Symmetric Antiferromagnets
Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics, School of Physics, Xi’an Jiaotong University（西安交通大学物理学院）；Division of Physics and Applied Physics, School of Physics and Mathematical Sciences, Nanyang Technological University（南洋理工大学物理与数学科学学院）；Department of Physics, University of Science and Technology of China（中国科学技术大学物理系）；Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University（华南师范大学物理学院）
Thickness-dependent magnon spin transport in antiferromagnetic insulators: Crossover from quasi-three-dimensional to quasi-two-dimensional regimes
Norwegian University of Science and Technology（挪威科技大学）；Eindhoven University of Technology（埃因霍温理工大学）；ENSTA, Institut Polytechnique de Paris（巴黎理工学院 ENSTA）
Nonreciprocal Magnon Hanle Effect in Antiferromagnetic $α$-Fe$_2$O$_3$
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften（瓦尔特·迈斯纳研究所，巴伐利亚科学院）；TUM School of Natural Sciences, Technische Universität München（慕尼黑工业大学自然科学学院）；Condensed Matter Physics Center (IFIMAC) and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid（马德里自治大学凝聚态物理中心（IFIMAC）和凝聚态物质理论物理系）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）
Plaid-Like Spin Splitting and Chirality of Magnon Bands in Antiferromagnetic MnTe$_2$
Sejong University（世宗大学）；Korea Advanced Institute of Science and Technology (KAIST)（韩国科学技术院）；Sungkyunkwan University（成均馆大学）；Institute of Physics, Academia Sinica（中央研究院物理研究所）
