Anomalously strong near-neighbor attraction in doped 1D cuprate chains

Abstract

Exploring cuprate chains Superconductivity in cuprates takes place in their two-dimensional (2D) layers but solving even the simplest model of interacting fermions in 2D is a challenge. The theory problem simplifies in 1D, with experiment becoming the tricky part. Chen et al . synthesized a cuprate that consists of parallel chains and behaves like a 1D system. Crucially, the material could be doped over a wide range of hole concentrations. The researchers showed that including a near-neighbor attractive interaction in a 1D model of interacting fermions was necessary to explain their photoemission measurements. —JS

Phonon-Mediated Long-Range Attractive Interaction in One-Dimensional Cuprates

“…The intensity of this "holon folding" spectral features cannot be captured in simulations of the typical single-band Hubbard model. Only by adding a substantial, attractive, near-neighbor interaction to the model can the theoretical simulations well-explain the experimental observations [40]. Due to the repulsive nature of the electrostatic interaction between electrons, such an attraction must be mediated by a virtual process that may involve degrees of freedom not present in the single-band electronic model.…”

“…With better control of theory in 1D systems, quantitative comparisons to experiment can be made with higher fidelity, which enable a determination of the most significant missing microscopic ingredients. Recently, in situ molecular beam epitaxy and angle-resolved photoemission techniques have enabled a study of the singleparticle spectral function across a range of doping in 1D cuprate chains [40]. These experiments have revealed an anomalously strong "holon folding" near k F with the same velocity as the holon, which reflects interactions in the charge channel.…”

“…( 1). More importantly, NGSED provides direct information about the phonon mediated effective interations V , which can be used to benchmark parameters extracted from experimental comparisons [40]. Following the NGSED framework, we consider a wavefunction ansatz [54]…”

Superlight pairs in face-centred-cubic extended Hubbard models with strong Coulomb repulsion

“…Various phases are predicted in extended Hubbard models, such as spin triplet pairing [15], d-wave superconductivity [12], Mott insulators [16], XY antiferromagnetism [17] and stripe order [18]. We note that experimental evidence for strong intersite attractions mediated by phonons has been reported recently in one-dimensional cuprates [19,20].…”

Structural Deformation and Metal-Semiconductor Transition in Coupled Carbon Chains

“…One-dimensional materials such as nanotubes, nanoribbons, nanorods, and nanowires posses various interesting transport and electronic properties [14,15,16]. These properties can be also explored under the application of structural deformation [17,18] for their potential applications in miniaturised devices.…”