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The evolution of a Landau Fermi liquid into a nonmagnetic Mott insulator withincreasing electronic interactions is one of the most puzzling quantum phasetransitions in physics. The vicinity of the transition is believed to hostexotic states of matter such as quantum spin liquids, exciton condensates andunconventional superconductivity. Semiconductor moir\'e materials realize ahighly controllable Hubbard model simulator on a triangular lattice, providinga unique opportunity to drive a metal-insulator transition (MIT) via continuoustuning of the electronic interactions. Here, by electrically tuning theeffective interaction strength in MoTe2/WSe2 moir\'e superlattices, we observea continuous MIT at a fixed filling of one electron per unit cell. Theexistence of quantum criticality is supported by the scaling behavior of theresistance, a continuously vanishing charge-gap as the critical point isapproached from the insulating side, and a diverging quasiparticle effectivemass from the metallic side. We also observe a smooth evolution of thelow-temperature magnetic susceptibility across the MIT and find no evidence oflong-range magnetic order down to ~ 5% of the Curie-Weiss temperature. Theresults signal an abundance of low-energy spinful excitations on the insulatingside that is further corroborated by the presence of the Pomeranchuk effect onthe metallic side. Our results are consistent with the universal criticaltheory of a continuous MIT from a Landau Fermi liquid to a nonmagnetic Mottinsulator in two dimensions.

Continuous Mott transition in semiconductor moir\'e superlattices