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We present the first direct-detection search for eV-to-GeV dark matter usinga new ~2-gram high-resistivity Skipper-CCD from a dedicated fabrication batchthat was optimized for dark-matter searches. Using 24 days of data acquired inthe MINOS cavern at the Fermi National Accelerator Laboratory, we measure thelowest rates in silicon detectors of events containing one, two, three, or fourelectrons, and achieve world-leading sensitivity for a large range of sub-GeVdark matter masses. Data taken with different thicknesses of the detectorshield suggest a correlation between the rate of high-energy tracks and therate of single-electron events previously classified as "dark current." Wedetail key characteristics of the new Skipper-CCDs, which augur well for theplanned construction of the ~100-gram SENSEI experiment at SNOLAB.

SENSEI: Direct-Detection Results on sub-GeV Dark Matter from a New Skipper-CCD