Plasmon-enhanced Direct Detection of sub-MeV Dark Matter
arxiv(2024)
摘要
Plasmon, a collective mode of electronic excitation in semiconductor
materials, provides a unique avenue for the detection of light dark matter
(DM). In this work, we first generalize the theoretical formalism of plasmon to
treat the relativistic DM particles. We demonstrate that the plasmon resonance
effect for sub-MeV DM can be significantly enhanced, particularly in scenarios
of boosted DM with a light mediator. Utilizing the first data from SENSEI at
SNOLAB, we derive a new strong limit on the sub-MeV DM-electron scattering
cross section, which is more stringent than those from liquid detectors.
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