Investigation of the Polarization-Dependence of Field-Induced Roton Minima in the 2D van der Waals Honeycomb Antiferromagnet YbBr3
Enhanced quantum fluctuations are believed to give rise to novel magnetic ground states and excitations. The presence of strong quantum fluctuations causes excitations to deviate from what is expected from semi-classical theories, where the effect of the fluctuations is taken into account perturbatively. In the van der Waals antiferromagnet YbBr3, strong quantum fluctuations are present due to the low coordination of the honeycomb planes of the material. Previous unpolarized inelastic neutron scattering (INS) experiments with a magnetic field applied perpendicular to the honeycomb planes of YbBr3 revealed 1) a broad continuum of excitations in the Brillouin zone boundary in zero-field, and 2) large damping and energy renormalization of the magnetic excitations in the field-canted phase. Matrix product states (MPS) and exact diagonalization (ED) treatments of the nearest-neighbor Heisenberg model on the 2D honeycomb lattice capture all the features of the observed dynamics at all fields. Interestingly, in the field-canted phase, MPS predicts roton-like minima in the longitudinal and transversal components of S(Q, E). This prediction is directly measurable with polarized INS.
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Hernandez, J. A.; EBERHARTER Alexander; FJELLVAG Oystein Slagtern; KENZELMANN Michel; Karl W. Krämer; LAEUCHLI Andreas; RAYMOND Stephane; ROESSLI Bertrand and SCHULER Michael. (2023). Investigation of the Polarization-Dependence of Field-Induced Roton Minima in the 2D van der Waals Honeycomb Antiferromagnet YbBr3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.CRG-3010
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