Phase diagram of an exactly solvable t-J ladder model

TL;DR

This paper investigates an exactly solvable t-J ladder model with supersymmetry, analyzing its ground state phase diagram and low-lying excitations to understand its physical properties.

Contribution

It introduces a specific integrable t-J ladder model with supersymmetry and explores how rung interactions affect its spectrum and phase diagram.

Findings

Identified the ground state phases of the model.

Analyzed the low-lying excitation spectrum.

Showed how rung interactions break supersymmetry.

Abstract

We study a system of one-dimensional t-J models coupled to a ladder system. A special choice of the interaction between neighbouring rungs leads to an integrable model with supersymmetry, which is broken by the presence of rung interactions. We analyze the spectrum of low-lying excitations and ground state phase diagram at zero temperature.