Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe_(2) nanodevices  

作　　者：Ying Xing Yiyu Liu Pu Yang Jun Ge Longxin Pan Junyan Wang Shichao Qi Yi Liu Jian Wang 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,College of New Energy and Materials,China University of Petroleum(Beijing),Beijing 102249,China [2]International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China [3]College of Chemistry,Beijing Normal University,Beijing 100875,China [4]Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices,Renmin University of China,Beijing 100872,China [5]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China [6]Hefei National Laboratory,Hefei 230088,China [7]Beijing Academy of Quantum Information Sciences,Beijing 100193,China [8]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Nano Research》2023年第10期12281-12285,共5页纳米研究（英文版）

基　　金：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).

摘　　要：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.

关 键 词：two-dimensional superconductor quantum phase transition quantum Griffiths singularity transition metal dichalcogenides electrical transport property 

分 类 号：O413[理学—理论物理]