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LEED pictures taken from [(a)–(c)] clean and [(d)–(f)] Na-deposited (1 min) surfaces at different temperatures: (a) 127 K, (b) 121 K, and (c) 80 K for the clean surface, (d) 110 K, (e) 102 K, and (f) 80 K for the Na-deposited surface. Both 8× spots and ×2 streaks are indicated with arrow heads and arrows, respectively.
(a) Intensity of eighth-order (8×) superstructure spots divided by that of fourth-order (4×) spots as a function of the sample temperature for clean and Na-deposited surfaces (the numbers in parentheses refer to the deposition time in minutes). (b) vs the amount of Na deposited. The dashed line is guide for the eyes.
Energy dispersion of a surface-state band responsible for the phase transition and a band bending diagram (inset). Fermi energies and the corresponding wave vectors before (dashed lines) and after (solid lines) doping with electrons by Na deposition on the surface are denoted. , , and are Fermi energy, bottom of a conduction band, and top of a valence band after (before) doping, respectively.
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