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.

过去几十年来，层状过渡金属二硫属化物（TMD）在基础物理和低维纳米器件应用方面引起了人们极大的兴趣。最近，在二维（2D） 4 Ha -TaSe ₂纳米器件中报道了伊辛超导和量子金属态的有趣现象。在这里，我们报告了厚度低至 2.5 nm 的机械剥离 4 Ha -TaSe ₂纳米器件中的磁场诱导超导体-金属转变 (SMT) 。我们在薄 4 Ha -TaSe ₂中观察到 SMT 的量子格里菲斯奇点 (QGS)通过执行超低温传输测量和激活的缩放分析来制备纳米器件。_{随着TaSe 2}纳米器件的厚度增加到10.6 nm，几乎无法检测到磁阻交叉区域的特征，揭示了SMT的厚度依赖性。在此过程中，无序强度起着主导作用。这项工作丰富了研究QGS的平台，并可能激发对同一二维超导系统中不同新颖量子现象之间相关性的进一步研究。