Below-gap 9 um circularly polarized light launches coherent 0.5 THz magnons in Sr2IrO4 with helicity-dependent phase and two-orders-of-magnitude higher efficiency than above-gap excitation, via one-photon two-magnon coupling.
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Nonresonant nonlinear magnonics in an antiferromagnet
Below-gap 9 um circularly polarized light launches coherent 0.5 THz magnons in Sr2IrO4 with helicity-dependent phase and two-orders-of-magnitude higher efficiency than above-gap excitation, via one-photon two-magnon coupling.