Two interacting particles in a disordered chain IV: Scaling of level curvatures

The curvatures of two-particle energy levels with respect to the enclosed m agnetic flux in mesoscopic disordered rings are investigated numerically. W e find that the typical value of the curvatures is increased by interaction s in the localised regime and decreased in the metallic regime. This confir ms a prediction by Akkermans and Pichard (Eur. Phys. J. B 1, 223 (1998)). T he interaction-induced changes of the typical curvatures at different energ ies and disorder strengths exhibit one-parameter scaling with a conductance -like single parameter. This suggests that interactions could influence the conductance of mesoscopic systems similarly.