Dominik M. Juraschek, Sebastian F. Maehrlein:
Phys. Rev. B 97, 174302 (2018), pp. 8;
arXiv:1801.05987 [cond-mat.mtrl-sci] (2018), pp. 8;
DOI: arXiv:1801.05987 [cond-mat.mtrl-sci]
In a recent report, sum-frequency excitation of a Raman-active phonon was experimentally demonstrated. This mechanism is the sibling of impulsive stimulated Raman scattering, in which the difference-frequency components of a light field excite a Raman-active mode. Here, we propose that also ionic Raman scattering analogously has a sum-frequency counterpart. We compare the four Raman mechanisms, photonic and ionic difference- and sum-frequency excitation, for three different example materials using a generalized oscillator model for which we calculate the parameters with density functional theory. Sum-frequency ionic Raman scattering completes the toolkit for controlling material properties by means of selective excitation of lattice vibrations.
The original publication is available by link DOI: 10.1103/PhysRevB.97.174302