title: Coexistence of metallic and insulating-like states in graphene.
abstract: Since graphene has been taken as the potential host material for next-generation electric devices, coexistence of high carrier mobility and an energy gap has the determining role in its real applications. However, in conventional methods of band-gap engineering, the energy gap and carrier mobility in graphene are seemed to be the two terminals of a seesaw, which limit its rapid development in electronic devices. Here we demonstrated the realization of insulating-like state in graphene without breaking Dirac cone. Using first-principles calculations, we found that ferroelectric substrate not only well reserves the Dirac fermions, but also induces pseudo-gap states in graphene. Calculated transport results clearly revealed that electrons cannot move along the ferroelectric direction. Thus, our work established a new concept of opening an energy gap in graphene without reducing the high mobility of carriers, which is a step towards manufacturing graphene-based devices.
authors.affiliation: 1] School of Science, Nanjing Forestry University, Nanjing, Jiangsu 210037, P. R. China [2] Key Laboratory of Soft Chemistry and Functional Materials (Ministry of Education), and Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, P. R. China.
authors.forename: Fang
authors.initials: F
authors.lastname: Wu
authors.affiliation: School of Materials and Chemical Engineering, Anhui University of Architecture, Hefei, Anhui 230022, P. R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Huang
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
authors.forename: Qunxiang
authors.initials: Q
authors.lastname: Li
authors.affiliation: Key Laboratory of Soft Chemistry and Functional Materials (Ministry of Education), and Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, P. R. China.
authors.forename: Kaiming
authors.initials: K
authors.lastname: Deng
authors.affiliation: Key Laboratory of Soft Chemistry and Functional Materials (Ministry of Education), and Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, P. R. China.
authors.forename: Erjun
authors.initials: E
authors.lastname: Kan