1. Omnics Research Group Department of Mathematics and Physics “Ennio De Giorgi” University of Salento, Institute of Nanotechnology CNR‐Nanotec INFN Sezione di Lecce Via per Monteroni Lecce 73100 Italy
2. Department of Electronic Engineering University of Rome Tor Vergata via del Politecnico 1 Roma 00133 Italy
3. Department of Materials Science and Engineering Inha University Incheon 22212 Republic of Korea