title: High Electron Mobility in Epitaxial Trilayer Graphene on Off-axis SiC(0001).
abstract: The van de Waals heterostructure formed by an epitaxial trilayer graphene is of particular interest due to its unique tunable electronic band structure and stacking sequence. However, to date, there has been a lack in the fundamental understanding of the electronic properties of epitaxial trilayer graphene. Here, we investigate the electronic properties of large-area epitaxial trilayer graphene on a 4° off-axis SiC(0001) substrate. Micro-Raman mappings and atomic force microscopy (AFM) confirmed predominantly trilayer on the sample obtained under optimized conditions. We used angle-resolved photoemission spectroscopy (ARPES) and Density Functional Theory (DFT) calculations to study in detail the structure of valence electronic states, in particular the dispersion of π bands in reciprocal space and the exact determination of the number of graphene layers. Using far-infrared magneto-transmission (FIR-MT), we demonstrate, that the electron cyclotron resonance (CR) occurs between Landau levels with a (B)(1/2) dependence. The CR line-width is consistent with a high Dirac fermions mobility of ~3000 cm(2)·V(-1)·s(-1) at 4 K.
authors.affiliation: CNRS- Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.|Synchrotron-SOLEIL, Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France.
authors.forename: Mahdi
authors.initials: M
authors.lastname: Hajlaoui
authors.affiliation: CNRS- Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Haikel
authors.initials: H
authors.lastname: Sediri
authors.affiliation: CNRS- Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Debora
authors.initials: D
authors.lastname: Pierucci
authors.affiliation: CNRS- Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Hugo
authors.initials: H
authors.lastname: Henck
authors.affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre &Marie Curie-Sorbonne Universités, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Thanyanan
authors.initials: T
authors.lastname: Phuphachong
authors.affiliation: Synchrotron-SOLEIL, Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France.
authors.forename: Mathieu G
authors.initials: MG
authors.lastname: Silly
authors.affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre &Marie Curie-Sorbonne Universités, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Louis-Anne
authors.initials: LA
authors.lastname: de Vaulchier
authors.affiliation: Synchrotron-SOLEIL, Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France.
authors.forename: Fausto
authors.initials: F
authors.lastname: Sirotti
authors.affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre &Marie Curie-Sorbonne Universités, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Yves
authors.initials: Y
authors.lastname: Guldner
authors.affiliation: Synchrotron-SOLEIL, Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France.
authors.forename: Rachid
authors.initials: R
authors.lastname: Belkhou
authors.affiliation: CNRS- Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Abdelkarim
authors.initials: A
authors.lastname: Ouerghi