The Contribution of the Nearest-Neighborhood Interaction to the Persistent Current in a Mesoscopic Ring Studied by a New Model
He Guang-Ping, Huazhong Li, Zhongshui Ma
We propose an effective description of the interaction between the nearest-neighboring particles in a continuum theory. The contributions of the electron-electron interaction to the persistent current in 1D strongly correlating mesoscopic rings with or without impurities are analyzed. It is shown that the nearest-neighborhood int eraction gives significant contributions to the current and correlation functions. The enhance of the theoretical value of current magnitude is observed at finite temperature in the presence of the impurity scattering. The statistical property of the persistent current over random impurity distribution is also discussed. It is found that the exponential law of the persistent current for a non-interacting system will remain in an interacting one, as long as the interactions between nonnearest-neighborhoods are excluded.
Communications in Theoretical Physics•Dec 15, 2001•0 citations