Two-dimensional Sb net generated nontrivial topological states in SmAgSb_(2) probed by quantum oscillations  

作　　者：袁健 石贤彪 杜红 李田 郗传英 王霞 夏威 王保田 钟瑞丹 郭艳峰 Jian Yuan;Xian-Biao Shi;Hong Du;Tian Li;Chuan-Ying Xi;Xia Wang;Wei Xia;Bao-Tian Wang;Rui-Dan Zhong;Yan-Feng Guo(School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China;Xingzhi College,Zhejiang Normal University,Jinhua 321100,China;Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,Hefei 230031,China;ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China [4]Xingzhi College,Zhejiang Normal University,Jinhua 321100,China [5]Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,Hefei 230031,China [6]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China

出　　处：《Chinese Physics B》2024年第7期51-58,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12004405,12334008,and 12374148);the Double First-Class Initiative Fund of Shanghai Tech University;the Analytical Instrumentation Center of Shanghai Tech University(Grant No.SPST-AIC10112914);the research fund from the Shanghai Sailing Program(Grant No.23YF1426900);the fund from the National Key R&D Program of China(Grant Nos.2022YFA1402702 and 2021YFA1401600)。

摘　　要：The REAgSb_(2)(RE = rare earth and Y) family has drawn considerable research interest because the two-dimensional Sb net in their crystal structures hosts topological fermions and hence rich topological properties. We report herein the magnetization and magnetotransport measurements of SmAgSb_(2) single crystal, which unveil very large magnetoresistance and high carrier mobility up to 6.2 × 10^(3)% and 5.58 × 10^(3)cm^(2)·V^(-1)·s^(-1), respectively. The analysis of both Shubnikov–de Haas and de Haas–van Alphen quantum oscillations indicates nontrivial Berry phases in the paramagnetic state while trivial Berry curvature in the antiferromagnetic state, indicating a topological phase transition induced by the antiferromagnetic order. It is also supported by the first-principles calculations. The results not only provide a new interesting topological material but also offer valuable insights into the correlation between magnetism and nontrivial topological states.

关 键 词：large magnetoresistance quantum oscillations topological phase transition 

分 类 号：O469[理学—凝聚态物理]