Abstract
The electronic and optical properties of a new type of hydrogenated graphene in the C${}_{4}$H phase have been studied using the first-principles many-body Green's function method ($\mathit{GW}$ approximation and Bethe--Salpeter equation). It demonstrates that strong charge-transfer excitonic effects dominate the optical properties of C${}_{4}$H. The binding energy of the first exciton, which turns out to be strongly localized, is as large as 1.67 eV. The spatial separation of exited electrons and holes makes C${}_{4}$H a candidate for the realization of excitonic Bose--Einstein condensate. Dark state provides a traveling path for the bound excitons. As the situation in graphane with H vacancies, changing H coverage changes the electronic and optical properties and the associated applications.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
