Universal transverse conductance between quantum Hall regions and (2+1)D bosonization

Using bosonization techniques for (2 + 1)D systems, we show that the transv erse conductance for a system with general current interactions, when measu red between perfect Hall regions is not renormalized at low temperatures. O ur method extends two results we have recently obtained on low dimensional fermionic systems: on the one hand, the relationship between universality o f Landauer conductance and universality of bosonization rules for (1 + 1)D systems, and on the other hand, the universal character of the bosonized to pological current associated to a (2 + 1)D fermionic system with current in teractions. (C) 2000 Elsevier Science B.V. All rights reserved.