Doping the Mott insulating state of the triangular-lattice Hubbard model reveals the Sordi transition

Understand

It has been reported that upon doping a Mott insulator, there can be a crossover to a pseudogaped metallic phase followed by a first-order transition to another thermodynamically stable metallic phase.

• We call this first-order metal-metal transition the Sordi transition.
• It was argued that the initial reports of Sordi transitions at finite temperature could be explained by finite size effects and biases related to the model and method used.
• In this work, we report the Sordi transition on larger clusters at finite temperature on a triangular lattice, where long-range antiferromagnetic fluctuations are frustrated, using a different method, the dynamical cluster approximation instead of the cellular dynamical mean-field theory.