Appearance of a saddle point in the energy spectrum of Bi1-xSbx alloysстатья
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Аннотация:We investigate experimentally the electron Fermi surface of the semimetallic alloys Bi, - , Sb, in
the composition interval 0.22(x(0.6. We have observed an electronic-topological transition of
the kind described by I. M. Lifshits which consists of the confluence of two isolated portions of the
electron isoenergetic surface, which are initially shifted with respect to the L point in opposite
directions relative to the mirror symmetry plane, to form a single dumbbell-shaped Fermi surface.
This topological transition is a consequence of the appearance of a saddle point in the electronic
energy spectrum of the Bi, -, Sb, alloys as a result of inversion of the bands about L with
increasing x. We show that the transformation of the electronic Fermi surface in these alloys can
be described over the entire interval of composition O(x(0.6 in terms of the McClure-Choi
dispersion relation when certain of the parameters of this relation are allowed to vary with x.