中国物理B ›› 2025, Vol. 34 ›› Issue (8): 87307-087307.doi: 10.1088/1674-1056/add5ce

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Quantum oscillations in TaCo2Te2 thin flakes

Ruiyang Jiang(蒋睿阳)1,2, Tian Le(乐天)3,†, Yunteng Shi(石云腾)1,2, Changcun Li(李长存)4, Xinyi Zheng(郑新义)1,2, Xingchen Guo(郭兴宸)1,2, Bingbing Tong(仝冰冰)1,5, Peiling Li(李沛岭)1,5, Ziwei Dou(窦子威)1, Xiaohui Song(宋小会)1,5, Jie Shen(沈洁)1, Zhaozheng Lyu(吕昭征)1,5, Guangtong Liu(刘广同)1,5, Fucai Liu(刘富才)4,6,‡, Li Lu(吕力)1,2,5,§, and Fanming Qu(屈凡明)1,2,5,¶   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Center for Quantum Matter, Institute for Advanced Study in Physics, Zhejiang University, Hangzhou 310027, China;
    4 School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;
    5 Hefei National Laboratory, Hefei 230088, China;
    6 Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313098, China
  • 收稿日期:2025-03-26 修回日期:2025-04-29 接受日期:2025-05-08 出版日期:2025-07-17 发布日期:2025-08-12
  • 通讯作者: Tian Le, Fucai Liu, Li Lu, Fanming Qu E-mail:tianlephy@zju.edu.cn;fucailiu@uestc.edu.cn;lilu@iphy.ac.cn;fanmingqu@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1403400 and 2020YFA0309200), the National Natural Science Foundation of China (Grant Nos. 12074417, 92065203, 92365207, and 92477115), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), the Synergetic Extreme Condition User Facility sponsored by the National Development and Reform Commission, and the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302600).

Quantum oscillations in TaCo2Te2 thin flakes

Ruiyang Jiang(蒋睿阳)1,2, Tian Le(乐天)3,†, Yunteng Shi(石云腾)1,2, Changcun Li(李长存)4, Xinyi Zheng(郑新义)1,2, Xingchen Guo(郭兴宸)1,2, Bingbing Tong(仝冰冰)1,5, Peiling Li(李沛岭)1,5, Ziwei Dou(窦子威)1, Xiaohui Song(宋小会)1,5, Jie Shen(沈洁)1, Zhaozheng Lyu(吕昭征)1,5, Guangtong Liu(刘广同)1,5, Fucai Liu(刘富才)4,6,‡, Li Lu(吕力)1,2,5,§, and Fanming Qu(屈凡明)1,2,5,¶   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Center for Quantum Matter, Institute for Advanced Study in Physics, Zhejiang University, Hangzhou 310027, China;
    4 School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;
    5 Hefei National Laboratory, Hefei 230088, China;
    6 Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313098, China
  • Received:2025-03-26 Revised:2025-04-29 Accepted:2025-05-08 Online:2025-07-17 Published:2025-08-12
  • Contact: Tian Le, Fucai Liu, Li Lu, Fanming Qu E-mail:tianlephy@zju.edu.cn;fucailiu@uestc.edu.cn;lilu@iphy.ac.cn;fanmingqu@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1403400 and 2020YFA0309200), the National Natural Science Foundation of China (Grant Nos. 12074417, 92065203, 92365207, and 92477115), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), the Synergetic Extreme Condition User Facility sponsored by the National Development and Reform Commission, and the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302600).

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摘要： The ternary transition-metal telluride TaCo$_{2}$Te$_{2}$ has been reported to host a topological band structure characterized by a nontrivial Berry phase. While transport properties have been investigated in both bulk crystals and thick flakes ($>$150 nm), studies on thin flakes ($< 100 $ nm) of this van der Waals (vdW) material remain scarce. We investigate the low-temperature transport properties of TaCo$_{2}$Te$_{2}$ thin flakes by fabricating Hall bar devices on mechanically exfoliated flakes with different thicknesses (15 nm and 90 nm). Temperature-dependent resistance measurements reveal that the 15-nm-thick sample exhibits a lower residual resistivity ratio and Debye temperature compared to the 90-nm-thick one. Magnetotransport measurements under perpendicular magnetic fields up to $\pm 14$ T demonstrate lower magnetoresistance, carrier concentration, and mobility in the thinner sample, suggesting increased phonon scattering due to defect-induced disorder. Remarkably, pronounced Shubnikov-de Haas (SdH) oscillations are observed above 8 T in both samples in spite of the defect-induced disorder. Analysis of the Landau fan diagram yields a non-zero Berry phase in both samples, indicating the existence of a topologically non-trivial phase in TaCo$_{2}$Te$_{2}$ thin flakes. Our findings establish TaCo$_{2}$Te$_{2}$ as a promising candidate for exploring intrinsic topological states in layered materials.

关键词: quantum oscillations, TaCo$_{2}$Te$_{2}$, thin flakes

Abstract: The ternary transition-metal telluride TaCo$_{2}$Te$_{2}$ has been reported to host a topological band structure characterized by a nontrivial Berry phase. While transport properties have been investigated in both bulk crystals and thick flakes ($>$150 nm), studies on thin flakes ($< 100 $ nm) of this van der Waals (vdW) material remain scarce. We investigate the low-temperature transport properties of TaCo$_{2}$Te$_{2}$ thin flakes by fabricating Hall bar devices on mechanically exfoliated flakes with different thicknesses (15 nm and 90 nm). Temperature-dependent resistance measurements reveal that the 15-nm-thick sample exhibits a lower residual resistivity ratio and Debye temperature compared to the 90-nm-thick one. Magnetotransport measurements under perpendicular magnetic fields up to $\pm 14$ T demonstrate lower magnetoresistance, carrier concentration, and mobility in the thinner sample, suggesting increased phonon scattering due to defect-induced disorder. Remarkably, pronounced Shubnikov-de Haas (SdH) oscillations are observed above 8 T in both samples in spite of the defect-induced disorder. Analysis of the Landau fan diagram yields a non-zero Berry phase in both samples, indicating the existence of a topologically non-trivial phase in TaCo$_{2}$Te$_{2}$ thin flakes. Our findings establish TaCo$_{2}$Te$_{2}$ as a promising candidate for exploring intrinsic topological states in layered materials.

Key words: quantum oscillations, TaCo$_{2}$Te$_{2}$, thin flakes

中图分类号:  (Electrical properties of specific thin films)

  • 73.61.-r
73.43.Qt (Magnetoresistance) 75.47.-m (Magnetotransport phenomena; materials for magnetotransport) 05.60.Gg (Quantum transport)