Prediction of anomalies in the velocity of sound for the pseudogap of hole-doped cuprates

TL;DR

This paper predicts sharp sound velocity anomalies at the pseudogap endpoint in hole-doped cuprates, suggesting a link to Mott physics and electronic transitions without symmetry breaking, which could clarify the pseudogap's origin.

Contribution

It introduces a theoretical prediction of sound anomalies at the pseudogap termination using a two-dimensional Hubbard model and cluster dynamical mean-field theory.

Findings

Sharp dips in sound velocity at the pseudogap endpoint.

Anomalies linked to supercritical phenomena and electronic transitions.

Potential experimental signatures to identify the pseudogap origin.

Abstract

We predict sound anomalies at the doping $\delta_{p}$ where the pseudogap ends in the normal state of hole-doped cuprates. Our prediction is based on the two-dimensional compressible Hubbard model using cluster dynamical mean-field theory. We find sharp anomalies (dips) in the velocity of sound as a function of doping and interaction. These dips are a signature of supercritical phenomena, stemming from an electronic transition without symmetry breaking below the superconducting dome. If experimentally verified, these signatures may help to solve the fundamental question of the nature of the pseudogap -- pinpointing its origin as due to Mott physics and resulting short-range correlations.