COMBINATION RULES, CHARGE SYMMETRY, AND HALL-EFFECT IN CUPRATES

The rule relating the observed Hall coefficient to the spin and charge responses of the uniform doped Mott insulator is derived. It is essen tial to include the contribution of holon and spinon three-current cor relations to the effective action of the gauge field. In the vicinity of the Mott insulating point the Hall coefficient is holon dominated a nd weakly temperature dependent. In the vicinity of a point of charge conjugation symmetry, the holon contribution to the observed Hall coef ficient is small: the Hall coefficient follows the temperature depende nce of the diamagnetic susceptibility with a sign determined by the Fe rmi-surface shape.