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Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe2 nanodevices

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Abstract

The layered transition metal dichalcogenides (TMDs) have raised considerable interest in the past decades for both fundamental physics and low-dimensional nanodevice applications. Recently, intriguing phenomena of Ising superconductivity and quantum metallic state have been reported in two-dimensional (2D) 4Ha-TaSe2 nanodevices. Here, we report the magnetic field induced superconductor–metal transition (SMT) in mechanical exfoliated 4Ha-TaSe2 nanodevices with thickness down to 2.5 nm. We observe the quantum Griffiths singularity (QGS) of SMT in thin 4Ha-TaSe2 nanodevices by performing ultralow temperature transport measurements and activated scaling analysis. With increasing the thickness of TaSe2 nanodevice to 10.6 nm, the signature of magnetoresistance crossing region can hardly be detected, revealing the thickness dependence of SMT. In this procedure, the disorder strength plays a dominant role. This work enriches the platform for studying QGS and may stimulate further investigations on the correlation between different novel quantum phenomena in the same 2D superconducting system.

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Acknowledgements

We greatly thank J. J. Yan and X. Lin for their assistance and support in the ultralow temperature transport measurements. We thank Z. J. Wang, Z. Y. Yang, J. W. Luo, P. F. Zhan, Z. H. Cui, and Y. L. Li for helpful discussions in revising the manuscript. This work was financially supported by the National Natural Science Foundation of China (Nos. 11888101, 11974430, and 12174442), the National Key R&D Program of China (Nos. 2018YFA0305600 and 2022YFA1403103), the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB28000000), the Innovation Program for Quantum Science and Technology (No. 2021ZD0302400), Young Elite Scientists Sponsorship Program by BAST (No. BYESS2023452), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (No. 22XNKJ20).

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Author notes

  1. Ying Xing Yiyu Liu, and Pu Yang contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum (Beijing), Beijing, 102249, China

    Ying Xing, Yiyu Liu, Pu Yang & Junyan Wang

  2. International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China

    Ying Xing, Jun Ge, Shichao Qi & Jian Wang

  3. College of Chemistry, Beijing Normal University, Beijing, 100875, China

    Pu Yang

  4. Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, 100872, China

    Longxin Pan & Yi Liu

  5. Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China

    Jian Wang

  6. Hefei National Laboratory, Hefei, 230088, China

    Jian Wang

  7. Beijing Academy of Quantum Information Sciences, Beijing, 100193, China

    Jian Wang

  8. CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, 100190, China

    Jian Wang

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  1. Ying Xing
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Correspondence to Ying Xing, Yi Liu or Jian Wang.

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Xing, Y., Liu, Y., Yang, P. et al. Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe2 nanodevices. Nano Res. 16, 12281–12285 (2023). https://doi.org/10.1007/s12274-023-5901-x

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  • DOI: https://doi.org/10.1007/s12274-023-5901-x

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