Stripe-Like Inhomogeneities, Carriers, and BCS-BEC Crossover in the High-Tc Cuprates

TL;DR

This paper proposes a model for high-Tc cuprates involving stripe-like inhomogeneities and three types of carriers, explaining their anomalous properties and the BCS-BEC crossover in pairing mechanisms.

Contribution

It introduces a novel framework with stripons, quasi-electrons, and svivons to explain high-Tc phenomena and the crossover between BCS and BEC regimes.

Findings

Carriers are polaron-like stripons, quasi-electrons, and svivons.

The model explains anomalous spectroscopic and transport properties.

Pairing involves transitions between stripons and quasi-electrons via svivon exchange.

Abstract

Considering both "large-U" and "small-U" orbitals, it is found that the carriers of the high-Tc cuprates are polaron-like "stripons" carrying charge and located on stripe-like inhomogeneities, "quasi-electrons" carrying charge and spin, and "svivons" carrying spin and lattice distortion. This is shown to result in the observed anomalous spectroscopic and transport properties of the cuprates. Pairing results from transitions between pair states of stripons and quasi-electrons through the exchange of svivons, and a crossover occurs between BCS and Bose-Einstein condensation behaviors.