title: Stretchable graphene: a close look at fundamental parameters through biaxial straining.
abstract: Tunable biaxial stresses, both tensile and compressive, are applied to a single layer graphene by utilizing piezoelectric actuators. The Gruneisen parameters for the phonons responsible for the D, G, 2D and 2D' peaks are studied. The results show that the D peak is composed of two peaks, unambiguously revealing that the 2D peak frequency (omega(2D)) is not exactly twice that of the D peak (omega(D)). This finding is confirmed by varying the biaxial strain of the graphene, from which we observe that the shift of omega(2D)/2 and omega(D) are different. The employed technique allows a detailed study of the interplay between the graphene geometrical structures and its electronic properties.
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany. f.ding@ifw-dresden.de
authors.forename: Fei
authors.initials: F
authors.lastname: Ding
authors.forename: Hengxing
authors.initials: H
authors.lastname: Ji
authors.forename: Yonghai
authors.initials: Y
authors.lastname: Chen
authors.forename: Andreas
authors.initials: A
authors.lastname: Herklotz
authors.forename: Kathrin
authors.initials: K
authors.lastname: Dörr
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Mei
authors.forename: Armando
authors.initials: A
authors.lastname: Rastelli
authors.forename: Oliver G
authors.initials: OG
authors.lastname: Schmidt