title: Raman characterization of ABA- and ABC-stacked trilayer graphene.
abstract: Bernal (ABA stacking order) and rhombohedral (ABC) trilayer graphene (3LG) are characterized by Raman spectroscopy. From a systematic experimental and theoretical analysis of the Raman modes in both of these 3LGs, we show that the G band, G' (2D) band, and the intermediate-frequency combination modes of 3LGs are sensitive to the stacking order of 3LG. The phonon wavevector q, that gives the double resonance Raman spectra is larger in ABC than ABA, which is the reason why we get the different Raman frequencies and their spectral widths for ABA and ABC 3LG. The weak electron-phonon interaction in ABC-stacked 3LG and the localized strain at the boundary between ABC- and ABA-stacked domains are clearly reflected by the softening of the G mode and the G' mode, respectively.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
authors.forename: Chunxiao
authors.initials: C
authors.lastname: Cong
authors.forename: Ting
authors.initials: T
authors.lastname: Yu
authors.forename: Kentaro
authors.initials: K
authors.lastname: Sato
authors.forename: Jingzhi
authors.initials: J
authors.lastname: Shang
authors.forename: Riichiro
authors.initials: R
authors.lastname: Saito
authors.forename: Gene F
authors.initials: GF
authors.lastname: Dresselhaus
authors.forename: Mildred S
authors.initials: MS
authors.lastname: Dresselhaus