Although the pseudogap in the weak coupling regime is mostly understood, in the strong coupling regime, it still poses an important challenge to the understanding of hole-doped cuprates. It has been proposed that short-range antiferromagnetic fluctuations and Mott physics were involved in the formation of the strong coupling pseudogap[1]. However, Mott physics might not be behind the formation of the pseudogap if the doubts raised in Ref.[2] about the observability of the Mott transition are confirmed.
I will first introduce the Mott transition and the pseudogap to motivate the theoretical study of the triangular Hubbard model. Then, using dynamical cluster approximation, I will show that the presence of a high-temperature Widom line at half filling should be a precursor to complex low temperature physics in the triangular lattice, such as a Mott transition and a non-trivial pseudogap in the doped Mott insulator. A thorough study of the phase diagram around the Mott transition gives valuable information on the physics of the pseudogap. The work at half filling appears in Ref.[3].
[1] G. Sordi, K. Haule, and A.-M. S. Tremblay, PRB 84(7):075161 (2011).
[2] A. Wietek, R. Rossi, F. Simkovic, M. Klett, P. Hansmann, M. Ferrero, E. M. Stoudenmire, T. Schäfer, and A. Georges, PRX 11, 041013 (2021).
[3] P.-O. Downey, O. Gingras, M. Charlebois, C.-D. Hébert, A.-M. S. Tremblay, arXiv:2207.08008
