Affiliation: | a Physics Department. Trinity College, Dublin 2, Ireland b Institute of Physics and Astronomy, University of Aarhus, DK-8000, Aarhus C, Denmark c INFM, Universita di Catania, Corso Italia 57, I-95129, Catania, Italy d Dipartimento di Fisica, Universita di Catania, Corso Italia 57, I-95129, Catania, Italy e CNR-IMETEM, Stradale Primosole 50, I-95100, Catania, Italy f CNR-LAMEL, Via Gobetti 101, I-40129, Bologna, Italy g Institut für Physik, Universität Augsburg, D-86135, Augsburg, Germany h Department of Electronic and Electrical Engineering, University of Surrey, Guildford, UK |