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Observable Zero Sound in Strongly Correlated Metals

J. P. Rodriguez
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Abstract

The slow zero-sound mode expected near the Mott transition in strongly interacting two-dimensional Fermi systems that are neutral is shown to persist as the physical sound mode in the case that the fermion carries electronic charge and is embedded in a positive ionic background. The latter sound velocity softens completely precisely at the Mott transition, indicating that a zone-center structural transition will occur in the system. We suggest that this phonon-softening mechanism is related to the structural transitions commonly observed in the oxide superconductors.

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J. P. Rodriguez. 1994-08-31. Observable Zero Sound in Strongly Correlated Metals. https://doi.org/10.1103/physrevlett.73.1675

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