Proposed experiment to find the Sordi transition in doped κ-BEDT systems*

Doping a Mott insulator triggers fascinating physics, such as the Sordi transition, a first-order transition between a pseudogap and a correlated Fermi liquid [1]. Although it is said that this transition could explain some of the most interesting features of cuprates, its origin remains unclear, and it has yet to be observed experimentally in 2D correlated systems. Recent work has dispelled the idea that the transition is an artifact of the specific numerical techniques used, as well as the fact that it is linked to magnetic transitions [2], but experimental confirmation is required to verify the existence of the Sordi transition. Because the Mott transition is inaccessible in cuprates, it’s necessary to search for it in other such as layered organic superconductors. Based upon results from dynamical cluster approximation on the triangular lattice Hubbard model, we propose a variety of experimental measurements for Hg-doped κ-BEDT layered organic superconductors to identify signatures of this elusive transition.

 

References

[1]. G. Sordi et al. Phys. Rev. B, 84 :075161, 2011.

[2]. P.-O. Downey et al. arXiv:2307.11190, 2023.

[3]. H. Oike et al. Nat. Comm. 8, 756, 2017.