Electronic properties of disordered valence-bond stripes in cuprate superconductors

TL;DR

This paper investigates the electronic properties of disordered stripe states in cuprate superconductors using Monte Carlo simulations, revealing a valence-bond glass phase with low-energy quasiparticles consistent with experimental STM observations.

Contribution

It introduces a model coupling charge-density wave order parameters to fermions, demonstrating the coexistence of valence-bond glass and quasiparticles in disordered stripe states.

Findings

Identification of a valence-bond glass phase in disordered stripe states.

Observation of interference phenomena in low-energy quasiparticles.

Correlation between STM and neutron scattering features in cuprates.

Abstract

We calculate electronic single-particle properties of short-range ordered stripe states, using Monte-Carlo simulations of collective charge-density wave (CDW) order parameters coupled to fermions on a 2d square lattice. For superconducting bond-centered stripes with a d-wave form factor, we find a valence-bond "glass" which coexists with low-energy quasiparticles featuring interference phenomena, in agreement with recent scanning-tunneling-microscopy (STM) measurements on underdoped BSCCO and CaNaCuOCl. Together with earlier work, our calculations provide a link between CDW features seen in STM and those in magnetic neutron scattering.