FIG. 5. Color online a Cut through the Fermi surface at k ,x=0 as a function of the tilt angle and the wave vector k ,y, with k ,y =0 being the symmetry center perpendicular to the steps. b QW left and resonance right band bottom energies as a function of the orientation of the substrate with respect to the 111 direction. The measurements have been done at h =80 eV and by scanning the photon beam across a cylindrical crystal.
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