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The mechanism by which the Fermi surface of high-$T_c$ cuprates undergoes adramatic change from a large hole-like barrel to small arcs or pockets onentering the pseudogap phase remains a question of fundamental importance. Herewe calculate the normal-state Hall coefficient from the resonating-valence-bondspin-liquid model developed by Yang, Rice and Zhang. In this model,reconstruction of the Fermi surface occurs via an intermediate regime where theFermi surface consists of both hole- and electron-like pockets. We find thatthe doping $(x)$ dependence of the Hall number transitions from $1+x$ to $x$over this narrow doping range. At low temperatures, a switch from a downturn toan upturn in the Hall coefficient signals the departure of the electron-likepockets from the Fermi surface.

Hall effect and Fermi surface reconstruction via electron pockets in the high-$T_c$ cuprates