Spontaneous damage annealing reactions as a possible source of low energy excess in semiconductor detectors
arXiv:2408.07518 · doi:10.1103/p7s5-4qjw
Abstract
In semiconductor detectors designed for capturing dark matter particles or neutrinos, when the detection threshold is constantly improved to increasingly low energies, an "excess" signal of apparent energy release events below a few hundred eV is observed in several different kinds of detectors. This becomes a big obstacle to the observation of actual dark matter signals, hindering the detectors' sensitivity for rare events in this energy range. Using atomistic simulations with a classical thermostat and a quantum thermal bath, we show that this kind of signal is consistent with energy release from long-term annealing events of complex defects that can be formed by any kind of nuclear recoil radiation events. Such energy releases are shown to have a very similar exponential dependence on energy release magnitudes as that observed in experiments. By detailed analysis of the annealing events, we show that crossing very low energy barriers can trigger larger energy releases in an avalanche-like effect. This explains why large energy release events can occur even down to cryogenic temperatures, where the significant migration of point defects in silicon is hardly ever possible.
arXiv comment22 pages. 18 figures
References in corpus (27)
- Reversible Work Transiton State Theory: Application to Dissociative Adsorption of Hydrogen
- The Waning of the WIMP? A Review of Models, Searches, and Constraints
- WIMP dark matter candidates and searches - current status and future prospects
- First results from the CRESST-III low-mass dark matter program
- SENSEI: Direct-Detection Results on sub-GeV Dark Matter from a New Skipper-CCD
- First Dark Matter Constraints from a SuperCDMS Single-Charge Sensitive Detector
- Searching for low-mass dark matter particles with a massive Ge bolometer operated above-ground
- First germanium-based constraints on sub-MeV Dark Matter with the EDELWEISS experiment
- Constraints on low-mass, relic dark matter candidates from a surface-operated SuperCDMS single-charge sensitive detector
- Results on MeV-scale dark matter from a gram-scale cryogenic calorimeter operated above ground
- Light Dark Matter Search with a High-Resolution Athermal Phonon Detector Operated Above Ground
- Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg-day Target Exposure of DAMIC at SNOLAB
- Exploring CEvNS with NUCLEUS at the Chooz Nuclear Power Plant
- EXCESS workshop: Descriptions of rising low-energy spectra
- Machine-learning based interatomic potential for phonon transport in perfect crystalline Si and crystalline Si with vacancies
- Portable implementation of a quantum thermal bath for molecular dynamics simulations
- Zero-Point Energy Leakage in Quantum Thermal Bath Molecular Dynamics Simulations
- Directional Sensitivity In Light-Mass Dark Matter Searches With Single-Electron Resolution Ionization Detectors
- A Stress Induced Source of Phonon Bursts and Quasiparticle Poisoning
- Cosmogenic activation of silicon
- Latest observations on the low energy excess in CRESST-III
- Slow relaxation of cascade-induced defects in Fe
- Velocity Dependent Dark Matter Interactions in Single-Electron Resolution Semiconductor Detectors with Directional Sensitivity
- Energy loss in low energy nuclear recoils in dark matter detector materials
- Measurement of the bulk radioactive contamination of detector-grade silicon with DAMIC at SNOLAB
- Repulsive interatomic potentials calculated at three levels of theory
- Aluminum Relaxation as the Source of Excess Low Energy Events in Low Threshold Calorimeters