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Pressure-Tunable Targets for Light Dark Matter Direct Detection: The Case of Solid Helium
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We propose hydrostatic pressure -- a well-established tool for tuning properties of condensed matter -- as a novel route for optimizing targets for light dark matter direct detection, specifically via phonons. Pressure dramatically affects compressible solids by boosting the speed of sound and phonon frequencies. Focusing on helium -- the most compressible solid -- our ab initio calculations illustrate how high pressure elevates helium from lacking single-phonon reach to rivaling leading candidates. Our work establishes pressure as an unexplored tuning knob for accessing lower dark matter mass regimes.
Forward citations
Cited by 5 Pith papers
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Broadband phonon production from axion absorption
Random nuclear spin orientations break momentum conservation, so axion absorption in crystals excites phonons across the whole Brillouin zone, yielding a broadband detection rate proportional to the phonon density of states.
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Coherence from interference: a solvable model of sub-GeV dark matter-nucleus scattering
In an exactly solvable 1D lattice, coherent and incoherent DM-nucleus structure factors differ only by a crystal-momentum delta function that becomes unimportant for n≥2 phonons, validating hybrid Inc+LW rate calculations.
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Photonic Freeze-In
Dark matter can be produced by photon annihilation through a loop-generated F² operator, a new photonic freeze-in scenario that is testable at low reheat temperatures.
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