1. Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas Fayetteville AR 72701 USA
2. Laboratorio TASC Istituto Officina dei Materiali (IOM)‐CNR Area Science Park, SS 14, Km 163.5 Trieste 34149 Italy
3. International Centre for Theoretical Physics (ICTP) Strada Costiera 11 Trieste I‐34100 Italy
4. Department of Physics University of Arkansas Fayetteville AR 72701 USA
5. Department of Physics Indian Institute of Technology Kanpur Kanpur Uttar Pradesh 208016 India
6. Department of Chemistry Wichita State University Wichita KS 67260 USA
7. Research and Services Division of Materials Data and Integrated System National Institute for Materials Science 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan
8. Department of Physical and Chemical Sciences University of L'Aquila via Vetoio L'Aquila 67100 Italy
9. CNR‐IMM Istituto per la Microelettronica e Microsistemi VIII Strada 5 Catania I‐95121 Italy