Integrable impurity in the supersymmetric t-J model

TL;DR

This paper investigates an integrable impurity in the supersymmetric t-J model, analyzing its effects on ground state properties, susceptibilities, specific heat, and transport, and identifying an impurity bound state in the holon sector.

Contribution

It introduces a tunable integrable impurity in the supersymmetric t-J model and studies its impact on various physical properties and bound states.

Findings

Impurity affects ground state and low-temperature thermodynamics.

Existence of an impurity bound state in the holon sector.

Impurity phase-shifts confirm bound state formation.

Abstract

An impurity coupling to both spin and charge degrees of freedom is added to a periodic t-J chain such that its interaction with the bulk can be varied continuously without losing integrability. Ground state properties, impurity contributions to the susceptibilities and low temperature specific heat are studied as well as transport properties. The impurity phase--shifts are calculated to establish the existence of an impurity bound state in the holon sector.