Coexisting Order in the Pseudogap State of Cuprates

TL;DR

This paper proposes that the pseudogap state in cuprates involves coexisting magnetic and quantum orders, revealing complex correlations and scale invariance that explain experimental tunneling and ARPES observations.

Contribution

It introduces a novel model of the pseudogap as a coexistence of magnetic diffuson and quantum Peierls order with scale-invariant correlations.

Findings

Identification of a magnetic diffuson as the pseudogap

Coexistence of classical localization and quantum orders

Explanation of tunneling peak and ARPES gap features

Abstract

A pseudogap is shown to be a magnetic diffuson (MD) in a state with classical localization order coexisting with Quantum Peierls (QP) order. A soft quantum localization mode, a phason, ensures scale invariance with strong correlations among different momentum states seen as a circular Fermi surface with a gap in ARPES when phase fluctuations are random. These correlations imply a state with coexisting order parameters at distinct length scales. Charge quantization and scale invariance accounts for the sharp peak in the excess tunneling current at V=0.