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This illustration shows that a pair of intense THz laser pulses drives spin waves in an antiferromagnetic material, which radiate nonlinear emissions at the sum- and difference-frequencies. Credit: Zhuquan Zhang.
This illustration shows that a pair of intense THz laser pulses drives spin waves in an antiferromagnetic material, which radiate nonlinear emissions at the sum- and difference-frequencies. Credit: Zhuquan Zhang.