Quasiparticle states driven by a scattering on the preformed electron pairs

TL;DR

This paper investigates how quasiparticle states evolve in underdoped cuprate superconductors across the phase transition, revealing spectral weight transfer and proposing microscopic explanations for these phenomena.

Contribution

It introduces a phenomenological self-energy model that explains ARPES data and describes spectral weight transfer in the pseudogap regime of cuprates.

Findings

Spectral weight shifts from Bogoliubov quasiparticles to in-gap states above T_c

The model reproduces key features of ARPES spectra in underdoped cuprates

Discussion of microscopic mechanisms behind quasiparticle state evolution

Abstract

We analyze evolution of the single particle excitation spectrum of the underdoped cuprate superconductors near the anti-nodal region, considering temperatures below and and above the phase transition. We inspect the phenomenological self-energy that reproduces the angle-resolved-photoemission-spectroscopy (ARPES) data and we show that above the critical temperature, such procedure implies a transfer of the spectral weight from the Bogoliubov-type quasiparticles towards the in-gap damped states. We also discuss some possible microscopic arguments explaining this process.