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26 April 2024 |
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Dynamical Signatures of Symmetry Broken and Liquid Phases in an $S=1/2$ Heisenberg Antiferromagnet on the Triangular Lattice | | Markus Drescher
; Laurens Vanderstraeten
; Roderich Moessner
; Frank Pollmann
; | | Date: |
7 Sep 2022 | | Abstract: | We present the dynamical spin structure factor of the antiferromagnetic
spin-$frac{1}{2}$ $J_1-J_2$ 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-to-nearest neighbour
interactions yields a rich phase diagram. We resolve the low-energy excitations
both in the $120^{circ}$-ordered phase and in the putative spin liquid phase
at $J_2/J_1 = 0.125$. 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. | | Source: | arXiv, 2209.03344 | | Services: | Forum | Review | PDF | Favorites | |
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