Symmetry control by Raman-mode excitations via anharmonic couplings with terahertz field-induced infrared modes in ferroaxial PbWO4
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Ultrafast conversion from a high- to low-symmetry structure is important for optical-switching devices. To realize such a conversion, we used nonlinear phononics. Exciting infrared-active modes with an intense terahertz pulse generates symmetry-reducing Raman ... ...
