AUTHOR=Forti S. , Principi A. , Bandurin D. TITLE=Editorial: Optoelectronic Properties of Two-Dimensional Systems JOURNAL=Frontiers in Physics VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.812601 DOI=10.3389/fphy.2021.812601 ISSN=2296-424X