Superconducting nanowires, a mature technology originally developed for quantum sensing, can be used as a target and sensor with which to search for dark matter interactions with electrons. Here we report on a 180-hour measurement of a tungsten silicide superconducting nanowire device with a mass of 4.3 nanograms. We use this to place new constraints on dark matter-electron interactions, including the strongest terrestrial constraints to date on sub-MeV (sub-eV) dark matter that interacts with electrons via scattering (absorption) processes.
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We thank Robert Lasenby for sharing preliminary results regarding geometric effects on the interaction rate and for helpful comments on a draft version of this manuscript. The work of Y. H. is supported by the Israel Science Foundation (Grant No. 1112/17), by the Binational Science Foundation (Grant No. 2016155), by the I-CORE Program of the Planning Budgeting Committee (Grant No. 1937/12), and by the Azrieli Foundation. The work of B. V. L. is supported by DOE Grant No. DE-SC0010107, by the Josephine de Karman Fellowship Trust, and by the MIT Pappalardo Fellowship. The experimental work on this effort at MIT was supported by the DOE under the QuantiSED program, Grant No. DE-SC0019129. Work on data analysis and manuscript preparation at MIT was supported by the Fermi Research Alliance, LLC (FRA) and the U.S. Department of Energy (DOE) under Contract No. DE-AC02-07CH11359. The MIT coauthors thank Brenden Butters for technical assistance.
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