Abstract
Using compressive uniaxial stress we have tuned the energy splitting between the spin-orbit-split and the light-hole valence band in GaP to be equal to the energy of two phonons (LO or TO). Thus, triply resonant second-order Raman scattering, where all three denominators involved in the Raman-scattering efficiency resonate simultaneously, becomes possible. We have observed the two-LO-, LO + TO-, and two-TO-phonon lines in triple-resonance conditions. We discuss the results in terms of Fr\"ohlich and deformation-potential interaction.
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