Ground State Phases of the Doped 4-Leg t-J Ladder

TL;DR

This study uses density matrix renormalization group techniques to explore the ground state phases of a doped 4-leg t-J ladder, revealing three distinct phases depending on doping and interaction parameters.

Contribution

The paper identifies and characterizes three different ground state phases in the doped 4-leg t-J ladder, including a novel striped CDW domain-wall phase.

Findings

Identification of a d_{x^2-y^2} pairing phase.

Discovery of a striped CDW domain-wall phase with fluctuating hole pairs.

Observation of phase separation regimes.

Abstract

Using density matrix renormalization group techniques, we have studied the ground state of the 4-leg t-J ladder doped near half-filling. Depending upon J/t and the hole doping x, three types of ground state phases are found: (1) a phase containing d_{x^2-y^2} pairs; (2) a striped CDW domain-wall phase, and (3) a phase separated regime. A CDW domain-wall consists of fluctuating hole pairs and this phase has significant d_{x^2-y^2} pair field correlations.