Electron Self-Energy of High Temperature Superconductors as Revealed by Angle Resolved Photoemission

TL;DR

This paper reviews how angle-resolved photoemission data reveals electron self-energy features in high-temperature superconductors, highlighting the need for new physics to fully understand their complex behaviors.

Contribution

It presents novel insights into the electron self-energy in high-Tc superconductors through analysis of photoemission data, emphasizing the limitations of conventional physics.

Findings

Identification of a d-wave superconducting gap

Detection of a collective mode in the superconducting state

Observation of pairing correlations in the pseudogap phase

Abstract

In this paper, we review some of the work our group has done in the past few years to obtain the electron self-energy of high temperature superconductors by analysis of angle-resolved photoemission data. We focus on three examples which have revealed: (1) a d-wave superconducting gap, (2) a collective mode in the superconducting state, and (3) pairing correlations in the pseudogap phase. In each case, although a novel result is obtained which captures the essense of the data, the conventional physics used leads to an incomplete picture. This indicates that new physics needs to be developed to obtain a proper understanding of these materials.