Thermal effects produced at cryogenic temperatures in materials used as bolometric detectors for dark matter

摘要

In the modern cryogenic technique the heat deposited as phonons, theionization and/or light from scintillation signals could be used for detection. Also, theformation of defects in the lattice structure of material is possible. In the case when theionization signal is used for detection, a bias voltage must be applied and thus thegeneralised Luke-Neganov effect must be considered with contributions from theenergy stored in the semiconductor lattice as stable defects in the form of Frenkel pairs.In the process of interaction between the projectile particle and the target, the transientphenomena by which the energy is transferred producing ionization, heat and defectswas investigated in the frame of a thermal spike model. A detailed discussion of theassociated difficulties of this analysis is done and the results put in evidence theinterplay between the primary energies deposited in the electronic and latticesubsystems. This process affects the effective number of defects and the energy stored,which is taken into consideration in the balance of energy conservation in LukeNeganov effect.