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

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

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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.

large magnetoresistancequantum oscillationstopological phase transition

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

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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

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaDouble First-Class Initiative Fund of ShanghaiTech UniversityAnalytical Instrumentation Center of ShanghaiTech UniversityShanghai Sailing ProgramNational Key R&D Program of ChinaNational Key R&D Program of China

120044051233400812374148SPST-AIC1011291423YF14269002022YFA14027022021YFA1401600

2024

10.1088/1674-1056/ad4bc2

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
年,卷(期)：2024.33(7)
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