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research article

Singularity with and without disorder at Affleck-Kennedy-Lieb-Tasaki points

Herviou, Loïc
•
Rey, Anthony
•
Mila, Frédéric  
April 22, 2025
Physical Review B

The Affleck-Kennedy-Lieb-Tasaki (AKLT) point of the bilinear-biquadratic spin-1 chain is a cornerstone example of a disorder point where short-range correlations become incommensurate, and correlation lengths and momenta are nonanalytic. While the presence of singularities appears to be generic for AKLT points, we show that for a family of SU⁡(𝑛) models, the AKLT point is not a disorder point: It occurs entirely within an incommensurate phase yet the wave vector remains singular on both sides of the AKLT point. We conjecture that this possibility is generic for models where the representation is not self-conjugate and the transfer matrix non-Hermitian, while for self-conjugate representations the AKLT points remain disorder points.

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Type
research article
DOI
10.1103/physrevb.111.l161118
Author(s)
Herviou, Loïc

Université Grenoble Alpes

Rey, Anthony

Paul Scherrer Institute

Mila, Frédéric  

École Polytechnique Fédérale de Lausanne

Date Issued

2025-04-22

Publisher

American Physical Society (APS)

Published in
Physical Review B
Volume

111

Issue

16

Article Number

L161118

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CTMC  
FunderFunding(s)Grant NumberGrant URL

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

212082,219339

Available on Infoscience
May 7, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/249944
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