  The problem of doping Mott insulators is of fundamental importance and
long-standing interest in the study of strongly correlated electron systems.
The advent of semiconductor based moir\'e materials opens a new ground for
simulating the Hubbard model on the triangular lattice and exploring the rich
phase diagram of doped Mott insulators as a function of doping and external
magnetic field. Based on our recent identification of spin polaron
quasiparticle in Mott insulator, in this work we predict a new metallic state
emerges at small doping and intermediate field range, a pseudogap metal that
exhibits a single-particle gap and a doping-dependent magnetization plateau.
