MECHANISM FOR PERSISTENT CURRENT IN MESOSCOPIC NORMAL RINGS BASED ON QUANTUM LUTTINGER SOLITONS

We propose that the electron-electron interactions and the grain bound aries in mesoscopic normal rings act as a singular perturbation with r espect to the single-electron picture. In the presence of a magnetic f ield it leads to the formation of a dynamical macroscopic quantum stat e composed of solitons and antisolitons in an excited Luttinger-like l iquid. The predicted amplitude of the persistent current in a disorder ed ring agrees with tile measured one. Other measured features are exp lained, and additional predictions, which can be tested experimentally , are presented.