FIG. 1. Color online Fermi surface cut along the ̄M̄ direction as a function of K coverage. The vertical lines mark the edge of the projected band gap in Cu 111 . The low coverage regime is characterized by the transformation of the Cu 111 surface state into a weak resonance, mostly quenched at 0.5 ML. Upon metallic condensation, the QW band shifts below the Fermi energy and the resonant emission strongly picks up dotted line .
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