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From deconfined spinons to coherent magnons in an antiferromagnetic Heisenberg chain with long range interactions

by Luhang Yang, Adrian E. Feiguin

Submission summary

As Contributors: Adrian Feiguin
Preprint link: scipost_202005_00013v1
Date submitted: 2020-05-27 02:00
Submitted by: Feiguin, Adrian
Submitted to: SciPost Physics
Discipline: Physics
Subject area: Condensed Matter Physics - Computational
Approach: Computational

Abstract

We study the nature of the excitations of an antiferromagnetic (AFM) Heisenberg chain with staggered long range interactions using the time-dependent density matrix renormalization group method and by means of a multi-spinon approximation. The chain undergoes true symmetry breaking and develops long range order, transitioning from a gapless spin liquid to a gapless ordered AFM phase. The spin dynamical structure factor shows that the emergence of N\'eel order can be associated to the formation of bound states of spinons that become coherent magnons. The quasiparticle band leaks out from the two-spinon continuum that is pushed up to higher energies. Our physical picture is also supported by an analysis of the behavior of the excitations in real-time.

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Submission scipost_202005_00013v1 on 27 May 2020

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