The layered transition metal dichalcogenides have emerged as valuable platforms to study the challenging problem of metal-insulator transition in two dimensions. It was demonstrated that multilayer $\mathrm{Mo}{\mathrm{S}}_2$ exhibits clearly distinctive metallic and insulating behaviors in conductivity in response to both temperature and the electric field. Here, we report on the scaling analyses of conductivity for the electric field in addition to the temperature, which is performed with the consideration of electron-electron interactions for multilayer $\mathrm{Mo}{\mathrm{S}}_2$. Based on the analysis of hot electron effects in the electric field, we find that scaling for the electric field is relevant for the metallic phase in the high-field regime, enabling one to extract the dynamical critical exponent $z$ close to 1. This result supports that the metal-insulator transition in multilayer $\mathrm{Mo}{\mathrm{S}}_2$ is a true quantum critical phenomenon, in which strong interactions induce the transition.

中文翻译：

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多层MoS2中金属-绝缘体转变附近的热电子效应和电场缩放

层状过渡金属二卤化物已成为研究二维二维金属-绝缘体过渡难题的重要平台。证明了多层$莫{\mathrm{小号}}_2$响应于温度和电场，在导电性方面表现出明显不同的金属和绝缘行为。在这里，我们报告了除温度以外的电场电导率的比例分析，该分析是考虑多层的电子-电子相互作用而进行的$莫{\mathrm{小号}}_2$。基于对电场中热电子效应的分析，我们发现电场的标度与高场态下的金属相有关，从而使人们能够提取动态临界指数$ž$ 接近1。该结果支持多层中的金属-绝缘体过渡 $莫{\mathrm{小号}}_2$ 是一种真正的量子临界现象，其中强烈的相互作用诱导了跃迁。