Doped coupled frustrated spin-1/2 chains with four-spin exchange

TL;DR

This paper investigates how different inter-chain couplings affect magnetic properties in doped frustrated spin-1/2 chains, revealing the role of four-spin interactions in soliton confinement and effective dopant interactions.

Contribution

It demonstrates that four-spin couplings can induce soliton confinement and influence dopant interactions, providing new insights into magnetic behavior in doped frustrated quantum spin chains.

Findings

Non-magnetic dopants release free spin-1/2 solitons.

Four-spin coupling causes soliton confinement.

Dopants on different chains have effective non-frustrating interactions.

Abstract

The role of various magnetic inter-chain couplings is investigated by numerical methods in doped frustrated quantum spin chains. A non-magnetic dopant introduced in a gapped spin chain releases a free spin-1/2 soliton. The formation of a local magnetic moment is analyzed in term of soliton confinement. A four-spin coupling which might originate from cyclic exchange is shown to produce such a confinement in contrast to transverse magnetic exchange. Dopants on different chains experience an effective space-extended non-frustrating pairwise spin interaction.