Quasiparticles as composite objects in the RVB superconductor

TL;DR

This paper investigates the nature of quasiparticles in an RVB superconductor, revealing that they are composite objects formed from confined spinon and holon excitations, with d-wave pairing stemming from antiferromagnetic correlations.

Contribution

It demonstrates that nodal quasiparticles are composite excitations and explains the origin of d-wave pairing within the phase string formulation of the t-J model.

Findings

Nodal quasiparticles are composite spinon-holon excitations.

Confinement of bare spinon and holon excitations in the superconducting state.

D-wave pairing arises from short-range antiferromagnetic correlations.

Abstract

We study the nature of the superconducting state, the origin of d-wave pairing, and elementary excitations of a resonating valence bond (RVB) superconductor. We show that the phase string formulation of the t-J model leads to confinement of bare spinon and holon excitations in the superconducting state, though the vacuum is described by the RVB state. Nodal quasiparticles are obtained as composite excitations of spinon and holon excitations. The d-wave pairing symmetry is shown to arise from short range antiferromagnetic correlations.