The Three Component Electronic Structure of the Cuprates Derived from SI-STM

TL;DR

This paper introduces a phenomenological model that unifies the low-energy electronic structure observations in cuprate superconductors from SI-STM, linking quasiparticle interference, LDOS, and phenomena like pseudogap across various doping levels.

Contribution

The model integrates QPI and LDOS measurements to explain the electronic structure and related phenomena in cuprates across different doping regimes.

Findings

Unified spectral density of states from QPI and LDOS

Identification of energy scales linked to pseudogap and other phenomena

Correlation of QPI termination and checkerboard modulations with energy scales

Abstract

We present a phenomenological model that describes the low energy electronic structure of the cuprate high temperature superconductor Bi2Sr2CaCu2O8+x as observed by Spectroscopic Imagining Scanning Tunneling Microscopy (SI-STM). Our model is based on observations from Quasiparticle Interference (QPI) measurements and Local Density of States (LDOS) measurements that span a range of hole densities from critical doping, p~0.19, to extremely underdoped, p~0.06. The model presented below unifies the spectral density of states observed in QPI studies with that of the LDOS. In unifying these two separate measurements, we find that the previously reported phenomena, the Bogoliubov QPI termination, the checkerboard conductance modulations, and the pseudogap are associated with unique energy scales that have features present in both the q-space and LDOS(E) data sets.