Stretchable graphene: a close look at fundamental parameters through biaxial straining.
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.
Ding
Fei
F
Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany. f.ding@ifw-dresden.de
Ji
Hengxing
H
Chen
Yonghai
Y
Herklotz
Andreas
A
Dörr
Kathrin
K
Mei
Yongfeng
Y
Rastelli
Armando
A
Schmidt
Oliver G
OG