Observable Zero Sound in Strongly Correlated Metals

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.

12 pgs, TeX, Accepted for publication in Physical Review Letters

References in corpus (2)

• Toward a Unified Magnetic Phase Diagram of the Cuprate Superconductors
• Berezinskii-Kosterlitz-Thouless Transition in Spin-Charge Separated Superconductor

Cited by in corpus (2)

• Drude weight and total optical weight in a t-t'-J model
• Confinement of Spin and Charge in High-Temperature Superconductors