Electro-phononic and magneto-phononic frequency conversion
arxiv(2024)
摘要
Nonlinear frequency conversion by optical rectification, as well as
difference- and sum-frequency generation are fundamental processes for
producing electromagnetic radiation at different frequencies. Here, we
demonstrate that coherently excited infrared-active phonons can be used as
transducers for generating nonlinear electric polarizations and magnetizations
via phonon-phonon and phonon-magnon interactions, in a way similar to nonlinear
optical frequency conversion. We derive analytical solutions for the
time-dependent polarizations and magnetizations for the second-order response
to the electric field component of an ultrashort laser pulse. These allow us to
define second-order nonlinear electric and magneto-electric susceptibilities
that capture the rectification, as well as the impulsive and sum-frequency
excitation of coherent phonons and magnons. Our theoretical framework naturally
incorporates existing mechanisms and further leads to the prediction of a
hybrid magneto-opto-phononic inverse Faraday effect involving
photon-phonon-magnon scattering. Our work demonstrates nonlinear phononics as a
pathway to controlling the electric polarization and magnetization in solids.
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