# Phenomenological Single-Particle Green's Function for the Pseudogap and Superconducting Phases of High-T$_c$ Cuprates

## TL;DR

This paper introduces a phenomenological Green's function model for high-Tc cuprates that explains ARPES observations like Fermi arcs and kinks, linking pseudogap and superconducting phases through a microscopic theory.

## Contribution

It develops a novel Green's function framework based on phase-string fractionalization to unify the understanding of pseudogap and superconducting phases in cuprates.

## Key findings

- Explains Fermi arc and kink phenomena as a function of doping.
- Connects pseudogap features with the two-gap structure in superconductors.
- Highlights the role of phase-string fractionalization in Green's function structure.

## Abstract

We present a phenomenological Green's function to characterize the superconducting and pseudogap phases of the cuprates based on a microscopic theory of doped Mott insulators. In this framework, the "Fermi arc" and "kink" phenomena observed by angle-resolved photoemission spectroscopy (ARPES) experiments in the pseudogap phase can be systematically explained as a function of doping, which is further connected to the two-gap feature in the superconducting phase with dichotomy between the nodal and antinodal physics. We demonstrate that a phase-string-induced fractionalization plays the key role in giving rise to such a peculiar Green's function with a unique two-component structure.