%0 Journal Article %1 PhysRevB.108.L220401 %A Drescher, Markus %A Vanderstraeten, Laurens %A Moessner, Roderich %A Pollmann, Frank %D 2023 %I American Physical Society %J Phys. Rev. B %K b %N 22 %P L220401 %R 10.1103/PhysRevB.108.L220401 %T Dynamical signatures of symmetry-broken and liquid phases in an S = $\frac12$ Heisenberg antiferromagnet on the triangular lattice %U https://link.aps.org/doi/10.1103/PhysRevB.108.L220401 %V 108 %X 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.

@article{PhysRevB.108.L220401, 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.}, added-at = {2024-02-05T17:09:54.000+0100}, author = {Drescher, Markus and Vanderstraeten, Laurens and Moessner, Roderich and Pollmann, Frank}, biburl = {https://www.bibsonomy.org/bibtex/2b87c36b5ac7a938e5ddd9a909403d92d/ctqmat}, day = 05, doi = {10.1103/PhysRevB.108.L220401}, interhash = {ec195224bb689c395c19c393677fda1b}, intrahash = {b87c36b5ac7a938e5ddd9a909403d92d}, journal = {Phys. Rev. B}, keywords = {b}, month = {12}, number = 22, numpages = {6}, pages = {L220401}, publisher = {American Physical Society}, timestamp = {2024-02-05T17:09:54.000+0100}, title = {Dynamical signatures of symmetry-broken and liquid phases in an S = $\mathbf{\frac{1}{2}}$ Heisenberg antiferromagnet on the triangular lattice}, url = {https://link.aps.org/doi/10.1103/PhysRevB.108.L220401}, volume = 108, year = 2023 }