Environmental control of electron-phonon coupling in barium doped graphene
- Author(s)
- N. I. Verbitskiy, A. V. Fedorov, C. Tresca, G. Profeta, L. Petaccia, B. V. Senkovskiy, D. Yu Usachov, D. V. Vyalikh, L. V. Yashina, A. A. Eliseev, T. Pichler, A. Grüneis
- Abstract
Two-dimensional superconductivity in alkali-and alkaline-Earth-metal doped monolayer graphene has been explained in the framework of electron-phonon coupling (EPC) and experiments yielded superconducting transition temperatures (TC) up to 6 K. In contrast to bulk graphite intercalation compounds, the interface of doped graphene with its environment affects its physical properties. Here we present a novel and well-defined BaC8 interface structure in Ba-doped single-layer graphene on Au and Ge substrates. We use angle-resolved photoemission spectroscopy in combination with ab initio modelling to extract the Eliashberg function and EPC for both substrates. This allows us to quantitatively assess the environmental effects for both Au and Ge substrates on superconductivity in graphene. We show that for semiconducting Ge substrates, the doping level and EPC are higher. Our study highlights that both dopant order and the metallicity of the substrate can be used to control EPC and hence superconductivity.
- Organisation(s)
- Electronic Properties of Materials
- External organisation(s)
- Universität zu Köln, Anuchin Research Institute and Museum of Anthropology, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Saint Petersburg State University, Università degli Studi dell’Aquila, Institute of Genetics and Biophysics "Adriano Buzzati-Traverso", CNR, Elettra─Sincrotrone Trieste, Technische Universität Dresden
- Journal
- 2D Materials
- Volume
- 3
- No. of pages
- 7
- ISSN
- 2053-1583
- DOI
- https://doi.org/10.1088/2053-1583/3/4/045003
- Publication date
- 12-2016
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Keywords
- ASJC Scopus subject areas
- Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering, Chemistry(all), Materials Science(all)
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/environmental-control-of-electronphonon-coupling-in-barium-doped-graphene(e8338896-50f6-4108-8d92-6533f82fd22e).html