Abstract
The spectral density at the Fermi energy and the formation of adlayer-induced electronic states is studied by means of high energy resolution ultraviolet photoemission spectroscopy. A highly ordered (1\ifmmode\times\else\texttimes\fi{}1)-Bi monolayer deposited on InAs(110) induces a well-resolved, occupied electronic state in the InAs surface gap, attributed to p-like dangling bonds at the Bi atomic chains. Appropriate annealing of a Bi multilayer produces a (1\ifmmode\times\else\texttimes\fi{}2)-symmetry stable phase. Evolution of the spectral density close to the Fermi edge brings to light the metallicity of the (1\ifmmode\times\else\texttimes\fi{}2)-Bi layer induced by Bi---Bi bonding in the atomic chains.
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