Quasiparticles in the Pseudogap Phase of Underdoped Cuprate

TL;DR

This paper discusses recent spectroscopic findings on quasiparticles in the pseudogap phase of underdoped cuprates, showing how these observations align with a specific theoretical propagator model.

Contribution

It demonstrates that the Yang et al. propagator accurately describes quasiparticle features in both the pseudogap and superconducting phases of underdoped cuprates.

Findings

Observation of particle-hole asymmetry in the pseudogap phase

Identification of maxima in energy dispersion

Reduced asymmetry in tunneling density of states

Abstract

Recent angle resolved photoemission \cite{yang-nature-08} and scanning tunneling microscopy \cite{kohsaka-nature-08} measurements on underdoped cuprates have yielded new spectroscopic information on quasiparticles in the pseudogap phase. New features of the normal state such as particle-hole asymmetry, maxima in the energy dispersion and accompanying drops in the spectral weight of quasiparticles agree with the ansatz of Yang \textit{et al.} for the single particle propagator in the pseudogap phase. The coherent quasiparticle dispersion and reduced asymmetry in the tunneling density of states in the superconducting state can also be described by this propagator.