Affiliation: | (1) Research Institute for Solid State Physics, H 1525 Budapest, Hungary;(2) Dept. Physics, University of Florida, 32611 Gainesville, FL;(3) Departement de Physique, École Polytechnique Féderale de Lausanne, CH-1015 Lausanne, Switzerland;(4) Department of Physics, SUNY at Stony Brook, 11794 Stony Brook, NY;(5) University of Bayreuth, D 95440, Germany |