Neganov–Luke Phonon Amplification in P-type Point Contact Detectors

Mirabolfathi, N.; Amman, M.; Faiez, Dana; Luke, P.N.; Martin, R. D.; Rolla, Julie; Sadoulet, B.; Serfass, B.; Vetter, K.

doi:10.1007/s10909-013-1050-z

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…The materials with higher values of work-function will be chosen to minimize this source of background. It is worth mentioning that breakdown observed at fields of order of ∼30 V/cm in the SuperCDMS-type detector at a base temperature of ∼30 mK was not due to the impact ionization of the bulk of the crystals [77]. This also indicates that thermal noise will not be a significant source of background.…”

Section: B Evaluation Of Backgroundsmentioning

confidence: 88%

Direct detection of MeV-scale dark matter utilizing germanium internal amplification for the charge created by the ionization of impurities

et al. 2018

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Light, MeV-scale dark matter (DM) is an exciting DM candidate that is undetectable by current experiments. A germanium (Ge) detector utilizing internal charge amplification for the charge carriers created by the ionization of impurities is a promising new technology with experimental sensitivity for detecting MeV-scale DM. We analyze the physics mechanisms of the signal formation, charge creation, charge internal amplification, and the projected sensitivity for directly detecting MeV-scale DM particles. We present a design for a novel Ge detector at helium temperature (∼ 4 K) enabling ionization of impurities from DM impacts. With large localized E-fields, the ionized excitations can be accelerated to kinetic energies larger than the Ge bandgap at which point they can create additional electron-hole pairs, producing intrinsic amplification to achieve an ultra-low energy threshold of ∼ 0.1 eV for detecting low-mass DM particles in the MeV scale. Correspondingly, such a Ge detector with 1 kg-year exposure will have high sensitivity to a DM-nucleon cross section of ∼ 5 × 10 −45 cm 2 at a DM mass of ∼ 10 MeV/c 2 and a DM-electron cross section of ∼ 5 × 10 −46 cm 2 at a DM mass of ∼ 1 MeV/c 2 .

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Section: B Evaluation Of Backgroundsmentioning

confidence: 88%