Scanning tunneling microscopy study on symmetry breaking of charge density wave in FeGe  

作　　者：Jiakang Zhang Ziyuan Chen Xueliang Wu Mingzhe Li Yuanji Li Ruotong Yin Jiashuo Gong Shiyuan Wang Aifeng Wang Dong-Lai Feng Ya-Jun Yan 张嘉康;陈子元;吴学良;李明哲;李元骥;尹若彤;巩佳硕;王适源;王爱峰;封东来;闫亚军

机构地区：[1]School of Emerging Technology and Department of Physics,University of Science and Technology of China,Hefei 230026,China [2]Low temperature Physics Laboratory,College of Physics and Center of Quantum Materials and Devices,Chongqing University,Chongqing 401331,China [3]National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology,New Cornerstone Science Laboratory,University of Science and Technology of China,Hefei 230026,China [4]Hefei National Laboratory,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Physics B》2025年第4期55-61,共7页中国物理B(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12374140,12494593,11790312,12004056,11774060,and 92065201);the National Key R&D Program of China(Grant No.2023YFA1406304);the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302803);the Fundamental Research Funds for the Central Universities of China(Grant Nos.2022CDJXY-002 and WK9990000103);the New Cornerstone Science Foundation.

摘　　要：The complex symmetry breaking states in AV3Sb5 family have attracted extreme research attention,but controversy still exists,especially in the question of time reversal symmetry breaking of the charge density wave(CDW).Most recently,a chiral CDW has been suggested in kagome magnet FeGe,but the related study is very rare.Here,we use a scanning tunneling microscope to study the symmetry breaking behavior of both the short-and long-range CDWs in FeGe.Different from previous studies,our study reveals an isotropic long-range CDW without obvious symmetry breaking,while local rotational symmetry breaking appears in the short-range CDW,which may be related to the existence of strong structural disorders.Moreover,the charge distribution of the short-range CDW is inert to the applied external magnetic fields and the detailed spin arrangements of FeGe,inconsistent with the expectation of a chiral CDW associated with chiral flux.Our results rule out the existence of spontaneous chiral and rotational symmetry breaking in the CDW state of FeGe,putting strong constraints on the further understanding of CDW mechanism.

关 键 词：symmetry breaking kagome magnet charge density wave 

分 类 号：O469[理学—凝聚态物理]