Schematic representation of an STM experiment. In our model the STM tip (a) has been replaced by an inhomogeneous barrier at z = 0 (b), which is described by the function f(ρ) (1) . Arrows schematically show directions of propagation of electron waves. In the point ρ 0 a point-like defect described by potential D(ρ − ρ 0, z) is situated.
Illustration of the occupied energy bands. Arrows show the direction of electron tunneling from surface states into bulk states.
Standing wave pattern in the conductance G as described by Eq. (17) . The dashed ellipse is the Fermi contour in momentum space. The center of the defect is placed in the point ρ = 0, and λ F /2π = ℏ/ , with my = 3mx .
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