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Research Article

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

Ying Xing1,2,§( ), Yiyu Liu1,§, Pu Yang1,3,§, Jun Ge2, Longxin Pan4, Junyan Wang1, Shichao Qi2, Yi Liu4( ), Jian Wang2,5,6,7,8( )
State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum (Beijing), Beijing 102249, China
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
College of Chemistry, Beijing Normal University, Beijing 100875, China
Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
Hefei National Laboratory, Hefei 230088, China
Beijing Academy of Quantum Information Sciences, Beijing 100193, China
CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China

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

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Graphical Abstract

The thickness dependence of quantum Griffiths singularity was observed in thin 4Ha-TaSe2 nanodevices, analyzed by finite size scaling and direct activated scaling methods.

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.

Keywords

two-dimensional superconductorquantum phase transitionquantum Griffiths singularitytransition metal dichalcogenideselectrical transport property

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Nano Research
Volume 16 Issue 10,
October 2023
Pages 12281-12285
DOI: 10.1007/s12274-023-5901-x
Cite this article:
Xing Y, Liu Y, Yang P, et al. Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe2 nanodevices. Nano Research, 2023, 16(10): 12281-12285. https://doi.org/10.1007/s12274-023-5901-x
Topics:
Nano device
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The 70th Anniversary of China University of Petroleum

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Received: 27 February 2023
Revised: 25 May 2023
Accepted: 07 June 2023
Published: 24 July 2023
© Tsinghua University Press 2023
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