PHYSICAL REVIEW LETTERS

Abstract

D. S. Petrov,1,2 M. Holzmann,3,4 and G. V. Shlyapnikov1,2,4 1FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands 2Russian Research Center, Kurchatov Institute, Kurchatov Square, 123182 Moscow, Russia 3CNRS-Laboratoire de Physique Statistique, Ecole Normale Superieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France 4Laboratoire Kastler-Brossel,* Ecole Normale Superieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France (Received 27 September 1999)