Abstract
We report the first experimental observation of a gap-opening and changes of the Fermi surface contours upon reconstruction of the W(001) surface. A gap Δ ≥ 0.6 eV is found to form at X̄', a new surface Brillouin zone boundary along the \\ ̄ bE azimuth of the reconstructed ( 2 × 2 ) R45° structure. The large gap and the Fermi surface contours of which the curvatures remain essentially unaltered through reconstruction suggest that the reconstruction is driven primarily by a strong-coupling charge density wave mechanism.
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