Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves
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PhysRevLett.118.207204.pdf
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Author(s)
Kurihara, Takayuki
Suemoto, Tohru
Lu, Jian
Li, Xian
Hwang, Harold Y.
Ofori-Okai, Benjamin Kwasi
Nelson, Keith Adam
Date Issued
May 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lu, Jian, Xian Li, Harold Y. Hwang, Benjamin K. Ofori-Okai, Takayuki Kurihara, Tohru Suemoto, and Keith A. Nelson. “Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves.” Physical Review Letters 118, no. 20 (May 18, 2017).
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.118.207204
