中心对称且具有非简单空间群结构的晶体中可调控的Dzyaloshinskii-Moriya相互作用  

Controlling Dzyaloshinskii-Moriya interaction in a centrosymmetric nonsymmorphic crystal

作　　者：张中义 秦盛山 臧佳栋 方辰 胡江平 张富春 Zhongyi Zhang;Shengshan Qin;Jiadong Zang;Chen Fang;Jiangping Hu;Fu-Chun Zhang(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics,Beijing Institute of Technology,Beijing 100081,China;Kavli Institute for Theoretical Sciences,CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China;Department of Physics and Astronomy,University of New Hampshire,Durham 03824,USA;Materials Science Program,University of New Hampshire,Durham 03824,USA;South Bay Interdisciplinary Science Center,Dongguan 523808,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Physics,Beijing Institute of Technology,Beijing 100081,China [4]Kavli Institute for Theoretical Sciences,CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China [5]Department of Physics and Astronomy,University of New Hampshire,Durham 03824,USA [6]Materials Science Program,University of New Hampshire,Durham 03824,USA [7]South Bay Interdisciplinary Science Center,Dongguan 523808,China [8]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Science Bulletin》2023年第11期1113-1118,M0003,共7页科学通报（英文版）

基　　金：the National Key Research and Development Program of China(2017YFA0303100 and 2022YFA1403901);the National Natural Science Foundation of China(12174428,11888101,11920101005,and 11674278);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB28000000 and XDB33000000);U.S.Department of Energy,Basic Energy Science(DESC0020221)。

摘　　要：非中心对称材料中存在的Dzyaloshinskii-Moriya(DM)相互作用,可以导致新颖的自旋纹理和奇异的手性物理现象.而如果能在中心对称的晶格中发现DM相互作用,这将可以大大丰富实现上述新奇物理的材料体系.本文发现中心对称的且遵循非简单空间群结构的巡游电子体系可以作为实现DM相互作用的新平台.以遵循P4/nmn空间群的晶格为例,作者展示了在该中心对称晶格中,由巡游电子导致的Ruderman-Kittel-Kasuya-Yosida(RKKY)相互作用中包含DM相互作用、Heisenberg交换相互作用和Kaplan-Shekhtman-Entin-wohlman-Aharony(KSEA)相互作用.在这其中,DM相互作用的DM矢量的方向取决于实空间中磁性原子的位置,DM相互作用的强度取决于动量空间中费米面的位置.该晶格体系中磁性相互作用的多样性,源于非简单空间群对称性保证的实空间中位置依赖的在位点群和倒空间中动量依赖的电子结构.本研究揭示了非简单空间群对称性如何影响晶体中的磁性,表明非简单空间群晶格体系是设计磁性相互作用非常有前景的平台.Presence of the Dzyaloshinskii-Moriya(DM)interaction in limited noncentrosymmetric materials leads to novel spin textures and exotic chiral physics.The emergence of DM interaction in centrosymmetric crystals could greatly enrich material realization.Here we show that an itinerant centrosymmetric crystal respecting a nonsymmorphic space group is a new platform for the DM interaction.Taking the P4/nmm space group as an example,we demonstrate that the Ruderman-Kittel-Kasuya-Yosida(RKKY)interaction induces the DM interactions,in addition to the Heisenberg exchange and the Kaplan-Shekhtman-Entinwohlman-Aharony(KSEA)interaction.The direction of DM vector depends on the positions of magnetic atoms in the real space,and the amplitude depends on the location of the Fermi surface in the reciprocal space.The diversity stems from the position-dependent site groups and the momentum-dependent electronic structures guaranteed by the nonsymmorphic symmetries.Our study unveils the role of the nonsymmorphic symmetries in affecting magnetism,and suggests that the nonsymmorphic crystals can be promising platforms to design magnetic interactions.

关 键 词：巡游电子 中心对称 物理现象 动量空间 费米面 磁性原子 

分 类 号：O641.3[理学—物理化学]