Disorder effects on the phase diagram of electron-doped cuprates using the two-particle self-consistent approach*

The two-particle self-consistent approach (TPSC) is a highly accurate theoretical method for electronic systems that can be described by the one-band Hubbard model in the weak to intermediate coupling regime. [1] In particular, it can successfully describe the electron-doped cuprates. One of the predictions of TPSC for these materials is that the pseudogap occurs when the antiferromagnetic spin correlation length become larger than the thermal de Broglie wave length. [1,2] This TPSC condition for the pseudogap has been confirmed experimentally in the underdoped regime. However, this analysis fails in the optimal doping regime. [3,4] In this work, we include the effect of impurities and disorder in TPSC using the impurity averaging technique. We then investigate the effect of disorder on the TPSC condition for the pseudogap and on the critical doping for the crossover temperature.

[1] Vilk, Y. M. et Tremblay, A.-M. S. J. Phys. I France7, 1309–1368 (1997).
[2] Kyung, B. et al, Phys. Rev. Lett.93, 147004 (2004).
[3] Motoyama, E. M. et al.Nature445, 186–189 (2007).
[4] Junfeng He et al, PNAS 116, 3449 (2019)