Fig. 3. Bilayer graphene topography (A) and simultaneous dI/dV maps at sample bias voltages of (B) –31 mV, (C) –13 mV, (D) 1.0 mV, and (E) 21 mV. The type B scattering centers lie outside the image region [see lower left corner of (A)]. (F to I) dI/dV (color scale) versus sample bias (horizontal axis) and distance (vertical axis) along corresponding red lines in (B) to (E). The blue-white-red color scale spans the conductance values observed in (J) to (M). (J to M) Line-averaged dI/dV spectra obtained from regions marked by red lines in (B) to (E). The spectra are averages of nine curves acquired at positions of the interference maxima in the region of the red lines. Peaks in the dI/dV spectra correlate with maxima in the long-wavelength modulation of the interference pattern. Blue arrows indicate the bias (energy) position of the corresponding conductance images in (B) to (E). I = 500 pA, V = 100 mV, V = 0.7 mV_rms. [View Larger Version of this Image (266K JPEG file)]

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