Quantum Phase Transitions Induced by Strong Correlations Rare-earth Metal Material LaS

This study integrates cellular dynamical mean-field theory with continuous-time quantum Monte Carlo methods to investigate how strong correlations affect quantum phase transitions in the quasi-two-dimensional square lattice of LaS. By analyzing changes in the density of states, double occupancy, and the spectral function on the Fermi surface of lanthanum and sulfur atoms, it is revealed that stronger correlations drive the system from a metallic state to a Mott insulating state. The phase transition is further confirmed through the spectral function near the Fermi surface. This study proposes a simulation scheme for quantum phase transitions by tuning interaction strength, providing new insights and valuable references for understanding the physical properties of LaS and its quantum phase transition mechanism.