Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.207204
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Funding
- Office of Naval Research [N00014-13-1-0509]
- Defense University Research Instrumentation Program [N00014-15-1-2879]
- National Science Foundation [CHE-1111557]
- Samsung Global Research Outreach program
- Japan Society for the Promotion of Science [26287060]
- Advanced Leading graduate school for Photon Science
- Grants-in-Aid for Scientific Research [26287060, 17K05508] Funding Source: KAKEN
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We report a demonstration of two-dimensional (2D) terahertz (THz) magnetic resonance spectroscopy using the magnetic fields of two time-delayed THz pulses. We apply the methodology to directly reveal the nonlinear responses of collective spin waves (magnons) in a canted antiferromagnetic crystal. The 2D THz spectra show all of the third-order nonlinear magnon signals including magnon spin echoes, and 2-quantum signals that reveal pairwise correlations between magnons at the Brillouin zone center. We also observe second-order nonlinear magnon signals showing resonance-enhanced second-harmonic and difference-frequency generation. Numerical simulations of the spin dynamics reproduce all of the spectral features in excellent agreement with the experimental 2D THz spectra.
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