Finite wave vector pairing in doped two-leg ladders

TL;DR

This paper investigates how Umklapp processes influence doped two-leg fermionic ladders, revealing that they can induce significant changes in physical behavior and stabilize pair-density wave phases, especially at specific fillings or under external potentials.

Contribution

It demonstrates that Umklapp processes can fundamentally alter physical properties and promote pair-density wave phases in doped two-leg ladders, a novel insight into their role.

Findings

Umklapp processes can stabilize pair-density wave phases.

Special band fillings or external potentials trigger Umklapp effects.

Physical properties of ladders are profoundly affected by Umklapp processes.

Abstract

We consider the effects of Umklapp processes in doped two-leg fermionic ladders. These may emerge either at special band fillings or as a result of the presence of external periodic potentials. We show that such Umklapp processes can lead to profound changes of physical properties and in particular stabilize pair-density wave phases.