Jones Zone of Group V Semimetals As and Sb

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Abstract
Band structures on the Jones zone boundary are calculated for group V semimetals arsenic and antimony by the pseudopotential method. Jones zone concept is shown to be useful for clear understanding of bonding-antibonding energy gap. Peculiarity of crystal structure is discussed on the basis of the perturbation theory of cohesive energy reinforced with the Jones zone concept. It is shown that the origin of internal displacement of sublattices is, as has been naively expected, in the opening of the gap on the Jones zone surface, but the rhombohedral shear comes from second order, metallic, binding energy.