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Change of the work function, Δϕ, of the Si(111) (blue circles) and silicene/ZrB2(0001) (black squares, red triangles) surfaces at room temperature with increasing potassium coverage, defined as the K/Si ratio x, as obtained at the NSLS-BL U5UA (blue circles, black squares) and KEK-PF BL-18A (red triangles) set-ups.
μ-LEED patterns recorded at 30 eV, corresponding to the K atom coverage of: (a) x = 0; (b) x = 0.08 ± 0.01; and (c) x = 0.16 ± 0.03.
Valence electronic structure of epitaxial silicene on ZrB2(0001) along the direction, in the vicinity of the point of the repeated BZ: (a) ARPES spectra of pristine silicene (x = 0); and (b) at a K/Si ratio of x = 0.18 ± 0.03.
ARPES spectra of epitaxial silicene on ZrB2(0001) along the direction, in the vicinity of the point of the 1st BZ: (a) at x = 0; (b) x = 0.09 ± 0.01; and (c) x = 0.18 ± 0.03.
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