Fig. 3: Single-wavefront dislocations induced by the anisotropic potential.
From: Visualizing a single wavefront dislocation induced by orbital angular momentum in graphene
a STM geometry of the periodic strained graphene with a defect on it. The size of the scanning window is 70 × 70 nm2. b An enlarged topographic image of a defect obtained through the tungsten tip (defect C, Vb = 0.4 V) on the strained structure. Scale bar: 0.5 nm. c FFT image of the defect in panel b. The inner asymmetric points result from intervalley scattering processes. The directions of intervalley scattering are marked in the inset with a1, a2, and a3. Scale bar: 5 nm−1. d–f Experimental wavefront dislocations in real space which are filtered along a1, a2, and a3 directions, which is perpendicular to the intervalley scattering peaks in panel c. Scale bar: 0.5 nm. The wavelength is about 0.37 nm. The change of wavefronts passing through the defects are indicated by the red arrows in d–f.
