Frustrated H-Induced Instability of Mo(110)

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Abstract
Using helium atom scattering Hulpke and Lüdecke recently observed a giant phonon anomaly for the hydrogen-covered W(110) and Mo(110) surfaces. An explanation which is able to account for this and other experiments is still lacking. Below we present density-functional theory calculations of the atomic and electronic structure of the clean and hydrogen-covered Mo(110) surfaces. For the full adsorbate monolayer the calculations provide evidence for a strong Fermi surface nesting instability. This explains the observed anomalies and resolves the apparent inconsistencies of different experiments.
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