Petit amphi (LPS) + ONLINE (Zoom)
Petit amphi (LPS) + ONLINE (Zoom)


02 Sep 2022


11h00 - 12h00

P.-O.DOWNEY: From the Widom line to the pseudogap: A complete map of the pseudogap in the triangular Hubbard model

	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