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Detecting Superlight Dark Matter with Fermi-Degenerate Materials
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We examine in greater detail the recent proposal of using superconductors for detecting dark matter as light as the warm dark matter limit of O(keV). Detection of such light dark matter is possible if the entire kinetic energy of the dark matter is extracted in the scattering, and if the experiment is sensitive to O(meV) energy depositions. This is the case for Fermi-degenerate materials in which the Fermi velocity exceeds the dark matter velocity dispersion in the Milky Way of ~10^-3. We focus on a concrete experimental proposal using a superconducting target with a transition edge sensor in order to detect the small energy deposits from the dark matter scatterings. Considering a wide variety of constraints, from dark matter self-interactions to the cosmic microwave background, we show that models consistent with cosmological/astrophysical and terrestrial constraints are observable with such detectors. A wider range of viable models with dark matter mass below an MeV is available if dark matter or mediator properties (such as couplings or masses) differ at BBN epoch or in stellar interiors from those in superconductors. We also show that metal targets pay a strong in-medium suppression for kinetically mixed mediators; this suppression is alleviated with insulating targets.
Forward citations
Cited by 13 Pith papers
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Unconventional Materials for Light Dark Matter Detection
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Light Dark Matter Detection with Sub-eV Transition-Edge Sensors
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Spin-dependent dark matter scattering in quasi-two-dimensional magnets
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On the relation between Migdal effect and dark matter-electron scattering in isolated atoms and semiconductors
The Migdal ionization rate from dark matter-nucleus scattering equals the dark matter-electron ionization form factor evaluated at momentum q_e = (m_e/m_N) q, enabling the first semiconductor Migdal estimate and new s...
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Absorption of Fermionic Dark Matter by Nuclear Targets
Fermionic dark matter absorbed by nuclei produces neutral-current recoil peaks, charged-current induced beta decays, and beta endpoint shifts, giving current and future experiments new ways to probe sub-GeV dark matter.
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Direct Deflection of Particle Dark Matter
A driven, shielded electromagnetic deflector can create propagating dark-matter millicharge and millicurrent waves that penetrate shields and are detectable with resonant LC circuits, extending direct-detection reach ...
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First direct search for light dark matter interactions in a transition-edge sensor
A 489-hour run of a tungsten transition-edge sensor, used as both target and readout, sets first-generation limits on sub-MeV dark matter scattering with electrons and nucleons and on dark photon absorption.
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Quantum Frontiers in High Energy Physics
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