Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Z25: Magnetization and Spin Dynamics: Theory II
11:30 AM–1:30 PM,
Friday, March 8, 2024
Room: 101F
Sponsoring
Unit:
GMAG
Chair: David Dahlbom, Oak Ridge National Laboratory
Abstract: Z25.00006 : Theoretical analysis of multi-magnon Excitations in 2D Antiferromagnet probed by Resonant Inelastic X-ray Scattering (RIXS)*
12:30 PM–12:42 PM
Presenter:
SUBHAJYOTI PAL
(National Institute of Science Education and Research)
Authors:
SUBHAJYOTI PAL
(National Institute of Science Education and Research)
Umesh Kumar
(Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA)
Prabhakar Prabhakar
(School of Physical Sciences, National Institute of Science Education and Research, a CI of Homi Bhabha National Institute, Jatni 752050, India)
Anamitra Mukherjee
(School of Physical Sciences, National Institute of Science Education and Research, a CI of Homi Bhabha National Institute, Jatni 752050, India)
Collaboration:
All computations were performed in the NOETHER, VIRGO, and KALINGA high performance clusters at NISER.
We compute the RIXS cross-section within the ultra-short core-hole lifetime (UCL) expansion of the Kramers-Heisenberg scattering amplitude that allows perturbative solution within linear spin wave theory (LSWT). We report detailed results for both spin-conserving and non-conserving channels. Apart from the widely discussed single magnon and bimagnon contributions, we show that three-magnon contributions in the spin non-conserving channel are useful to explain certain features of the RIXS data for two-dimensional cuprates. We confirm the qualitative correctness of the LSWT conclusions for the three-magnon excitation with exact diagonalization. Our work puts constraints on the dispersion of the three-magnon in the Brillouin zone, opening new avenues for realizing higher modes of quasiparticles using RIXS.
*A.M. would like to acknowledge the MATRICS grant (Grant No. MTR/2022/000636) from the Science and Engineering Research Board (SERB) for funding.
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