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Data underpinning "Revealing Quadrupolar Excitations with Non-Linear Spectroscopy" - MaRDI portal

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Data underpinning "Revealing Quadrupolar Excitations with Non-Linear Spectroscopy"

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DOI10.5281/zenodo.11106522Zenodo11106522MaRDI QIDQ6716957

Dataset published at Zenodo repository.

Author name not available (Why is that?)

Publication date: 26 May 2024

Copyright license: No records found.



Description

Local moments with a spin S1/2 can exhibit a rich variety of elementary quasiparticle excitations, such as quadrupolar excitations, that go beyond the dipolar magnons of conventional spin-1/2 systems. However, the experimental observation of such quadrupolar excitations is often challenging due to the dipolar selection rules of many linear response probes, rendering them invisible. Here we show that non-linear spectroscopy, in the form of two-dimensional coherent spectroscopy (2DCS), can be used to reveal quadrupolar excitations. Considering a family of spin-1 Heisenberg ferromagnets with single-ion easy-axis anisotropy as an example, we explicitly calculate their 2DCS signature by combining exact diagonalization and generalized spin wave theory. We further demonstrate that 2DCS can provide access to the quadrupolar weight of an excitation, analogous to how linear response provides access to the dipolar weight. Our work highlights the potential of non-linear spectroscopy as a powerful tool to diagnose multipolar excitations in quantum magnets.






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