PHYSICAL REVIEW LETTERS, cilt.124, sa.11, 2020 (SCI-Expanded)
We report constraints on the dark photon effective kinetic mixing parameter (kappa) with data taken from two p-type point-contact germanium detectors of the CDEX-10 experiment at the China Jinping Underground Laboratory. The 90% confidence level upper limits on kappa of solar dark photon from 205.4 kg-day exposure are derived, probing new parameter space with masses (m(V)) from 10 to 300 eV/c(2) in direct detection experiments. Considering dark photon as the cosmological dark matter, limits at 90% confidence level with my from 0.1 to 4.0 keV/c(2) are set from 449.6 kg-day data, with a minimum of kappa = 1.3 x 10(-15) at my = 200 eV/c(2).