Two-dimensional Sb net generated nontrivial topological states in SmAgSb2 probed by quantum oscillations

袁健 ¹石贤彪 ²杜红 ³李田 ⁴郗传英 ⁵王霞 ¹夏威 ⁶王保田 ²钟瑞丹 ³郭艳峰⁶

扫码查看

作者信息

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. School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China
折叠

Abstract

The REAgSb2(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 SmAgSb2 single crystal,which unveil very large magnetoresistance and high carrier mobility up to 6.2 × 103％and 5.58 × 103 cm2·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.

Key words

large magnetoresistance/quantum oscillations/topological phase transition

引用本文复制引用

基金项目

National Natural Science Foundation of China(12004405)

National Natural Science Foundation of China(12334008)

National Natural Science Foundation of China(12374148)

Double First-Class Initiative Fund of ShanghaiTech University()

Analytical Instrumentation Center of ShanghaiTech University(SPST-AIC10112914)

Shanghai Sailing Program(23YF1426900)

National Key R&D Program of China(2022YFA1402702)

National Key R&D Program of China(2021YFA1401600)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量53

段落导航