Photo from Scientific Research

Low-energy electron diffraction measurements (colour bar: measured intensity) indicate how the subsurface V atoms give rise to a \(\sqrt{3}\times \sqrt{3}R3{0}^{\circ }\) superstructure, which leads to the reduced Brillouin zone shown by the dashed lines in a and b . Corresponding band folding is evident about these Brillouin zone boundaries, while additional chemical potential shifts and momentum-dependent band splittings are observed in the experimental data (compare with the calculations of the pristine monolayer).

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