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We present new direct-detection constraints on eV-to-GeV dark matterinteracting with electrons using a prototype detector of the Sub-Electron-NoiseSkipper-CCD Experimental Instrument. The results are based on data taken in theMINOS cavern at the Fermi National Accelerator Laboratory. We focus on dataobtained with two distinct readout strategies. For the first strategy, we readout the Skipper-CCD continuously, accumulating an exposure of 0.177 gram-days.While we observe no events containing three or more electrons, we find a largeone- and two-electron background event rate, which we attribute to spuriousevents induced by the amplifier in the Skipper-CCD readout stage. For thesecond strategy, we take five sets of data in which we switch off allamplifiers while exposing the Skipper-CCD for 120k seconds, and then read outthe data through the best prototype amplifier. We find a one-electron eventrate of (3.51 +- 0.10) x 10^(-3) events/pixel/day, which is almost two ordersof magnitude lower than the one-electron event rate observed in thecontinuous-readout data, and a two-electron event rate of (3.18 +0.86 -0.55) x10^(-5) events/pixel/day. We again observe no events containing three or moreelectrons, for an exposure of 0.069 gram-days. We use these data to deriveworld-leading constraints on dark matter-electron scattering for masses between500 keV to 5 MeV, and on dark-photon dark matter being absorbed by electronsfor a range of masses below 12.4 eV.

SENSEI: Direct-Detection Constraints on Sub-GeV Dark Matter from a Shallow Underground Run Using a Prototype Skipper-CCD