# The ladder physics in the Spin Fermion model

## TL;DR

This paper links the spin-fermion model of cuprates with fermionic ladder physics, showing how it explains the pseudogap phenomenon through nonperturbative results and the emergence of a d-Mott state.

## Contribution

It establishes a connection between the spin-fermion model and fermionic ladder physics, enabling nonperturbative analysis of the pseudogap in cuprates.

## Key findings

- Paramagnon exchange supports the d-Mott state formation.
- The spin-fermion model accurately describes the pseudogap.
- Nonperturbative results enhance understanding of cuprate physics.

## Abstract

A link is established between the spin-fermion (SF) model of the cuprates and the approach based on the analogy between the physics of doped Mott insulators in two dimensions and the physics of fermionic ladders. This enables one to use nonperturbative results derived for fermionic ladders to move beyond the large-N approximation in the SF model. It is shown that the paramagnon exchange postulated in the SF model has exactly the right form to facilitate the emergence of the fully gapped d-Mott state in the region of the Brillouin zone at the hot spots of the Fermi surface. Hence the SF model provides an adequate description of the pseudogap.