1. Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via
P. Gobetti 101, 40129 Bologna, Italy
2. Institute of Materials Research
and Engineering (IMRE), Agency for Science, Technology, and Research (A*STAR), 3 Research Link, Singapore 117602
3. Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) Via P. Gobetti 101, 40129 Bologna, Italy
4. Microelectronics Research Centre, The University of Texas at Austin, Austin, Texas 78758,
United States