dc.contributor.authorDeng, Tianqi
dc.contributor.authorSu, Haibin
dc.identifier.citationDeng, T., & Su, H. (2015). Orbital-dependent Electron-Hole Interaction in Graphene and Associated Multi-Layer Structures. Scientific Reports, 5, 17337-.en_US
dc.description.abstractWe develop an orbital-dependent potential to describe electron-hole interaction in materials with structural 2D character, i.e. quasi-2D materials. The modulated orbital-dependent potentials are also constructed with non-local screening, multi-layer screening, and finite gap due to the coupling with substrates. We apply the excitonic Hamiltonian in coordinate-space with developed effective electron-hole interacting potentials to compute excitons’ binding strength at M (π band) and Γ (σ band) points in graphene and its associated multi-layer forms. The orbital-dependent potential provides a range-separated property for regulating both long- and short-range interactions. This accounts for the existence of the resonant π exciton in single- and bi-layer graphenes. The remarkable strong electron-hole interaction in σ orbitals plays a decisive role in the existence of σ exciton in graphene stack at room temperature. The interplay between gap-opening and screening from substrates shed a light on the weak dependence of σ exciton binding energy on the thickness of graphene stacks. Moreover, the analysis of non-hydrogenic exciton spectrum in quasi-2D systems clearly demonstrates the remarkable comparable contribution of orbital dependent potential with respect to non-local screening process. The understanding of orbital-dependent potential developed in this work is potentially applicable for a wide range of materials with low dimension.en_US
dc.format.extent14 p.en_US
dc.relation.ispartofseriesScientific Reportsen_US
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/en_US
dc.titleOrbital-dependent Electron-Hole Interaction in Graphene and Associated Multi-Layer Structuresen_US
dc.typeJournal Article
dc.contributor.researchInstitute of Advanced Studiesen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.description.versionPublished versionen_US

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