Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 87: Frustrated Magnets: Spin Liquids
TT 87.6: Vortrag
Freitag, 22. März 2024, 10:45–11:00, H 3010
Spectral Functions in S=1/2 Antiferromagnetic Heisenberg Models on the Triangular Lattice — •Markus Drescher1, Laurens Vanderstraeten2, Roderich Moessner3, and Frank Pollmann1,4 — 1Department of Physics, Technische Universität München, 85748 Garching, Germany — 2Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, 1050 Brussels, Belgium — 3Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany — 4Munich Center for Quantum Science and Technology, 80799 Munich, Germany
We consider an extended spin-1/2 antiferromagnetic Heisenberg model on the triangular lattice with nearest- and next-nearest-neighbor interactions and an additional scalar chiral term that gives rise to a rich phase diagram comprising putative quantum spin-liquid phases alongside magnetically ordered states with a coplanar 120∘ order, stripe order and a noncoplanar tetrahedral order. Using large-scale matrix-product-state simulations, we obtain the spectral responses in distinct ordered and liquid regimes of the phase diagram and review our results in the light of analytical predictions such as mean-field theory and spin-wave calculations. We also discuss finite-size effects and the role of different cylinder geometries for the spectral function.
Keywords: spin liquids; tensor network simulation; triangular lattice