 98110 G. Benfatto, G. Gentile, V. Mastropietro
 Peierls instability for the Holstein model.
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Mar 2, 98

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Abstract. We consider the static Holstein model, describing a chain of Fermions
interacting with a classical phonon field, when the interaction is weak
and the density is a rational number.
We show that the energy of the system, as a function of the phonon field,
has two stationary points, defined up to a lattice translation,
which are local minima in the space of fields periodic with period equal
to the inverse of the density.
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