Coulomb impurity effects on the zero-Landau level splitting of graphene on polar substrates. (April 2017)

• Record Type: Journal Article
• Authors: Xiao, Yao; Li, Wei-Ping; Li, Zhi-Qing; Wang, Zi-Wu
• Is Part Of: Superlattices and microstructures. Volume 104(2017)
• Page Start: 178
• Page End: 185
• Publication Date: 2017-04
• Subjects: Graphene -- Fröhlich polaron -- Coulomb impurity; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2017.02.025
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: We theoretically investigate the effects of the Coulomb impurity on the zero-Landau level splitting of graphene on different polar substrates basing on the Fr ö hlich polaron model, in which the polaron is formed due to the carriers-surface optical phonon coupling. We discuss the influence of Coulomb impurity on the zero-Landau level splitting in the case of weak and strong coupling limits. We find that the splitting energy can be varied in a large scale due to the Coulomb impurity, which provides the possible theoretical explanation for the experimental measurements regarding the energy gap opened and zero-Landau level splitting in Landau quantized graphene. Highlights: Fröhlich polaron is formed due to surface optical phonons in graphene. Coulomb impurity results in the large scale splitting of zero-Landau level. Fröhlich polaron are discussed in the case of weak and strong coupling limits.