Dark matter phonon coupling
Dark matter phonon coupling
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暗物质声子耦合
DOI:
10.1103/physrevd.100.055011
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发表时间:
2019
影响因子:
5
通讯作者:
Rajendran, Surjeet
中科院分区:
文献类型:
--
作者:
Cox, Peter;Melia, Tom;Rajendran, Surjeet
Generically, the effective coupling between the dark matter and an atom scales with the number of constituents in the atom, resulting in the effective coupling being proportional to the mass of the atom. In this limit, when the momentum transfer is also small, we show that the leading term in the scattering of a particle off the optical phonons of an array of atoms, whether in a crystal or in a molecule, vanishes. Next-generation dark matter direct detection experiments with sub-electron-volt energy thresholds will operate in a regime where this effect is important, and the suppression can be up to orderover naive expectations. For dark matter that couples differently to protons and neutrons, the suppression is typically of order 10–100 but can be avoided through a judicious choice of material, utilizing variations in nuclear ratiosto break the proportionality of the coupling to mass. We provide explicit illustrations of this effect by calculating structure factors for dimolecules and for the crystals NaI and sapphire.
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