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 sub-GeV limits.
The role of ionization electrons in direct dark matter detection
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In this paper we estimate the event rates of neutralino-nucleus scattering leading to electron emission by the atomic ionization. We find that the branching ratio for detecting electrons vis a vis the traditional neutralino nucleus elastic scattering sensitively depends on the threshold energy. In the case of a light target and a neutralino mass of 100 GeV we estimate it to be around 10 percent assuming a reasonable threshold energy of 250 eV.
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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 sub-GeV limits.