Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves
Coherent Two-Dimensional Terahertz Magnetic Resonance Spectroscopy of Collective Spin Waves
复制标题
DOI：
10.1103/physrevlett.118.207204
复制
发表时间：
2017-05-18
影响因子：
8.6
通讯作者：
Nelson, Keith A.
中科院分区：
文献类型：
--
作者：
Lu, Jian;Li, Xian;Nelson, Keith A.
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.
