Hall Effect in Hole-doped Cuprates: Pairing Fluctuations Versus Fermi Surface Reconstruction

In this talk we address a theory for Hall coefficient R_H measurements in hole-doped cuprates at variable doping and temperature. For some time these experiments, and particularly the sign change near Tc, were argued to support a preformed pair interpretation of the pseudogap. For the most part this body of theoretical work has been based on a weak pairing fluctuation picture. More recently an alternative Fermi-liquid-like viewpoint has come into favor in which R_H is argued to provide information about the number density and character of the effective charge carriers. Our work seeks to shed light on this controversy. We address what is missing in previous calculations of R_H
within the preformed pair framework, providing additional support for this viewpoint. Here we incorporate strong pairing fluctuations in a
manner compatible with a substantial pseudogap and with a very high temperature diamagnetism onset [1710.03246 and proceeding talk].
Following the important constraint imposed by the Ward-Takahashi identity, we quantify and disentangle contributions from fermionic quasiparticles and bosonic pairs.