Dynamical signatures of symmetry-broken and liquid phases in an S = 12 Heisenberg antiferromagnet on the triangular lattice

Markus Drescher, Laurens Vanderstraeten, Roderich Moessner, Frank Pollmann

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We present the dynamical spin structure factor of the antiferromagnetic spin-12 J1-J2 Heisenberg model on a triangular lattice obtained from large-scale matrix-product state simulations. The high frustration due to the combination of antiferromagnetic nearest- and next-nearest-neighbor interactions yields a rich phase diagram. We resolve the low-energy excitations both in the 120∘ ordered phase and in the putative spin-liquid phase at J2/J1=0.125. In the ordered phase, we observe an avoided decay of the lowest magnon branch, demonstrating the robustness of this phenomenon in the presence of gapless excitations. Our findings in the spin-liquid phase chime with the field-theoretical predictions for a gapless Dirac spin liquid, in particular the picture of low-lying monopole excitations at the corners of the Brillouin zone. We comment on possible practical difficulties of distinguishing proximate liquid and solid phases based on the dynamical structure factor.

Original languageEnglish
Article numberL220401
JournalPhysical Review B
Volume108
Issue number22
DOIs
StatePublished - 1 Dec 2023

Fingerprint

Dive into the research topics of 'Dynamical signatures of symmetry-broken and liquid phases in an S = 12 Heisenberg antiferromagnet on the triangular lattice'. Together they form a unique fingerprint.

Cite this