Near the boundary between ordered and disordered quantum phases, several experiments have demonstrated metallic behaviour that defies the Landau Fermi paradigm^1,2,3,4,5. In moiré heterostructures, gate-tuneable insulating phases driven by electronic correlations have been recently discovered^{6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23}. Here, we use transport measurements to characterize metal–insulator transitions (MITs) in twisted WSe₂ near half filling of the first moiré subband. We find that the MIT as a function of both density and displacement field is continuous. At the metal–insulator boundary, the resistivity displays strange metal behaviour at low temperatures, with dissipation comparable to that at the Planckian limit. Further into the metallic phase, Fermi liquid behaviour is recovered at low temperature, and this evolves into a quantum critical fan at intermediate temperatures, before eventually reaching an anomalous saturated regime near room temperature. An analysis of the residual resistivity indicates the presence of strong quantum fluctuations in the insulating phase. These results establish twisted WSe₂ as a new platform to study doping and bandwidth-controlled metal–insulator quantum phase transitions on the triangular lattice.

在有序和无序量子相之间的边界附近，一些实验证明了违反朗道费米范式的金属行为^1,2,3,4,5。在莫尔异质结构中，最近发现了由电子相关性驱动的栅极可调绝缘相^{6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22 ,23} . 在这里，我们使用传输测量来表征扭曲的 WSe _{2中的金属 - 绝缘体跃迁 (MIT)}接近第一个莫尔子带的一半填充。我们发现 MIT 作为密度和位移场的函数是连续的。在金属 - 绝缘体边界处，电阻率在低温下表现出奇怪的金属行为，耗散与普朗克极限相当。进一步进入金属相，费米液体行为在低温下恢复，这在中间温度下演变为量子临界扇，最终在室温附近达到异常饱和状态。残余电阻率分析表明绝缘相中存在强量子涨落。这些结果建立了扭曲的 WSe ₂ 作为研究三角晶格上掺杂和带宽控制的金属 - 绝缘体量子相变的新平台。