SPINORS IN A FLUCTUATING SU(2) FLUX

Single (spinor) particle motions in randomly fluctuating U(1) and SU(2 ) magnetic fluxes in two dimensions are compared. While the problems a re similar in the weak-fluctuation limit, strikingly different physica l behavior is found in the strong-fluctuation limit. The orbital susce ptibility with respect to an external magnetic field vanishes in the s trong-coupling U(1) limit, while in the SU(2) case a finite paramagnet ic response exists, with an effective coupling constant 2e. Potential applications of the results to spin liquids and other problems are dis cussed.