Dark Matter Direct Detection with Quantum Dots
- URL: http://arxiv.org/abs/2208.05967v1
- Date: Wed, 10 Aug 2022 18:00:00 GMT
- Title: Dark Matter Direct Detection with Quantum Dots
- Authors: Carlos Blanco, Rouven Essig, Marivi Fernandez-Serra, Harikrishnan
Ramani, Oren Slone
- Abstract summary: We propose using Quantum Dots as novel targets to probe sub-GeV dark matter-electron interactions.
Quantum dots can be efficient scintillators, with near unity single-photon quantum yields.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We propose using Quantum Dots as novel targets to probe sub-GeV dark
matter-electron interactions. Quantum dots are nanocrystals of semiconducting
material, which are commercially available, with gram-scale quantities
suspended in liter-scale volumes of solvent. Quantum dots can be efficient
scintillators, with near unity single-photon quantum yields, and their
band-edge electronic properties are determined by their characteristic size,
which can be precisely tuned. Examples include lead sulfide (PbS) and lead
selenide (PbSe) quantum dots, which can be tuned to have sub-eV optical gaps. A
dark-matter interaction can generate one or more electron-hole pairs
(excitons), with the multi-exciton state decaying via the emission of two
photons with an efficiency of about 10% of the single-photon quantum yield. An
experimental setup using commercially available quantum dots and two
photo-multiplier-tubes (PMTs) for detecting the coincident two-photon signal
can already improve on existing dark-matter bounds, while using photodetectors
with lower dark-count rates can improve on current constraints by orders of
magnitude.
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