Subthermal Mean Transverse Energies Induced by Electron Refraction on the Jump in Mass at the Surface of Multialkali PhotocathodesRemoveS. A. Rozhkov, V. V. Bakin, H. E. Scheibler, V. S. Rusetsky, D. V. Gorshkov, D. A. Kustov, V. A. Golyashov, V. L. Alperovich, and O. E. TereshchenkoPhys. Rev. Lett. 136, 127001 (2026)
