Figure 6

Strain-plot, topography and LDOS of graphene/Ge(110). (a) Topography image of sample surface made by contact mode AFM showing domain boundaries; (b) plot of the 2D vs G-band positions for the graphene film. Coloured lines indicate the E_2D and E_G relationship for strained undoped (biaxial-strain is represented by the blue line and uniaxial strain by the black line), and unstrained p-doped (ε = 0, red line) graphene. The neutrality point (zero point) was taken from literature³⁹, and corresponds to the expected 2D and G positions for suspended freestanding single-layer graphene; (c) (dI/dV)/(I/V) curve measured at the black dots of Fig. 3b. The dotted line indicates the Fermi level (E_F) and the blue arrow indicates the position of the Dirac point (E_D).