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Lu J, Li X, Hwang HY, et al. Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves. Phys Rev Lett. 2017;118(20):207204doi: 10.1103/PhysRevLett.118.207204.
Lu, J., Li, X., Hwang, H. Y., Ofori-Okai, B. K., Kurihara, T., Suemoto, T., & Nelson, K. A. (2017). Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves. Physical review letters, 118(20), 207204. https://doi.org/10.1103/PhysRevLett.118.207204
Lu, Jian, et al. "Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves." Physical review letters vol. 118,20 (2017): 207204. doi: https://doi.org/10.1103/PhysRevLett.118.207204
Lu J, Li X, Hwang HY, Ofori-Okai BK, Kurihara T, Suemoto T, Nelson KA. Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves. Phys Rev Lett. 2017 May 19;118(20):207204. doi: 10.1103/PhysRevLett.118.207204. Epub 2017 May 18. PMID: 28581810.
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Phys Rev Lett. 2017 May 19;118(20):207204. doi: 10.1103/PhysRevLett.118.207204. Epub 2017 May 18.

Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves.

Physical review letters

Jian Lu, Xian Li, Harold Y Hwang, Benjamin K Ofori-Okai, Takayuki Kurihara, Tohru Suemoto, Keith A Nelson

Affiliations

  1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  2. Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

PMID: 28581810 DOI: 10.1103/PhysRevLett.118.207204

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.

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