1. Consiglio Nazionale delle Ricerche (CNR) Istituto per la Microelettronica e Microsistemi (IMM) Strada VIII n.5, Zona Industriale 95121 Catania Italy
2. Department of Mathematics and Computer Science Physics and Earth Science (MIFT) University of Messina Viale F. Stagno d’Alcontres, 31 98166 Messina Italy
3. Computational Materials Group Department of Mechanical and Electrical Engineering (DME) University of Southern Denmark (SDU) Sønderborg Denmark