Past colloquia and seminars


From the Widom line to the pseudogap : A complete map of the pseudogap in the triangular Hubbard model

Academic or specialist Seminar

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. During the presentation, 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, it will be shown 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 will give valuable pieces of information on the physics of the pseudogap. The work at half filling appears in Ref. ~[3].

When? 13.10.2022 11:15
Where? PER 08 0.51
Chemin du Musée 3
1700 Fribourg
speaker Pierre-Olivier Downey
University of Sherbrooke, Canada
Contact Département de Physique, Groupe Werner
Prof. Philipp Werner