Multiple-magnon excitations shape the spin spectrum of cuprate parent compounds

@article{ WOS:000646722000005,
Author = {Betto, Davide and Fumagalli, Roberto and Martinelli, Leonardo and Rossi,
   Matteo and Piombo, Riccardo and Yoshimi, Kazuyoshi and Di Castro,
   Daniele and Di Gennaro, Emiliano and Sambri, Alessia and Bonn, Doug and
   Sawatzky, George A. and Braicovich, Lucio and Brookes, Nicholas B. and
   Lorenzana, Jose and Ghiringhelli, Giacomo},
Title = {{Multiple-magnon excitations shape the spin spectrum of cuprate parent
   compounds}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{2021}},
Volume = {{103}},
Number = {{14}},
Month = {{APR 26}},
Abstract = {{Thanks to high resolution and polarization analysis, resonant inelastic
   x-ray scattering (RIXS) magnetic spectra of La2CuO4, Sr2CuO2Cl2 and
   CaCuO2 reveal a rich set of properties of the spin-(1)(/2)
   antiferromagnetic square lattice of cuprates. The leading single-magnon
   peak energy dispersion is in excellent agreement with the corresponding
   inelastic neutron scattering measurements. However, the RIXS data unveil
   an asymmetric line shape possibly due to odd higher order terms.
   Moreover, a sharp bimagnon feature emerges from the continuum at (1/2,
   0), coincident in energy with the bimagnon peak detected in optical
   spectroscopy. These findings show that the inherently complex spin
   spectra of cuprates, an exquisite manifestation of quantum magnetism,
   can be effectively explored by exploiting the richness of RIXS cross
   sections.}},
DOI = {{10.1103/PhysRevB.103.L140409}},
Article-Number = {{L140409}},
ISSN = {{2469-9950}},
EISSN = {{2469-9969}},
ORCID-Numbers = {{Rossi, Matteo/0000-0002-4254-0713
   Piombo, Riccardo/0000-0001-8855-9893}},
Unique-ID = {{WOS:000646722000005}},
}