S−phybridization effects on the metal-nonmetal phase transition in expanded liquid mercury

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The metal-nonmetal phase transition in expanded mercury is studied within a tight-binding Hamiltonian that takes into account $s\ensuremath{-}p$ hybridization. The multiband electronic structure is solved by means of the cluster Bethe-lattice method. Analytic expressions are given for the appearance of energy gaps in terms of the average coordination number and the Hamiltonian parameters. It is shown that $s\ensuremath{-}p$ hybridization effects play an important role in the metal-nonmetal phase transition.