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Non-Loudon-Fleury Raman scattering in spin-orbit coupled Mott insulators

Yang, Yang ; Li, Mengqun ; Rousochatzakis, Ioannis ; Perkins, Natalia B.

Physical review. B, 2021-10, Vol.104 (14), Article 144412 [Periódico revisado por pares]

College Park: American Physical Society

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  • Título:
    Non-Loudon-Fleury Raman scattering in spin-orbit coupled Mott insulators
  • Autor: Yang, Yang ; Li, Mengqun ; Rousochatzakis, Ioannis ; Perkins, Natalia B.
  • Assuntos: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Insulators ; Magnetic dipoles ; magnetism ; Magnons ; Materials Science ; Mott insulators ; Photons ; Physics ; Raman spectra ; spin-orbit coupling ; Spin-orbit interactions
  • É parte de: Physical review. B, 2021-10, Vol.104 (14), Article 144412
  • Notas: USDOE Office of Science (SC), Basic Energy Sciences (BES)
    National Science Foundation (NSF)
    SC0018056; NSF PHY-1748958
  • Descrição: We revisit the theory of magnetic Raman scattering in Mott insulators with strong spin-orbit coupling, with a major focus on Kitaev materials. We show that Kitaev materials with bond-anisotropic interactions are generally expected to show both one- and two-magnon responses. It is further shown that, in order to obtain the correct leading contributions to the Raman vertex operator R, one must take into account the precise, photon-assisted microscopic hopping processes of the electrons and that, in systems with multiple hopping paths, R contains terms beyond those appearing in the traditional Loudon-Fleury theory. Most saliently, a numerical implementation of the revised formalism to the case of the three-dimensional hyperhoneycomb Kitaev material β−Li2 IrO3 reveals that the non-Loudon-Fleury scattering terms actually dominate the Raman intensity. In addition, they induce a qualitative modification of the polarization dependence, including, e.g., the emergence of a sharp one-magnon peak at low energies, which is not expected in the traditional Loudon-Fleury theory. This peak is shown to arise from microscopic photon-assisted tunneling processes that are of similar type with the ones leading to the symmetric off-diagonal interaction Γ(known to be present in many Kitaev materials), but take the form of a bond-directional magnetic dipole term in the Raman vertex. These results are expected to apply across all Kitaev materials and mark a drastic change of paradigm for the understanding of Raman scattering in materials with strong spin-orbit coupling and multiple exchange paths.
  • Editor: College Park: American Physical Society
  • Idioma: Inglês
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