Speaker
Description
Understanding the energy transport in low-temperature detectors is essential for rare-event searches, quantum sensing applications, and studies of radiation-induced effects in matter. In this work, we extend the G4CMP framework to describe charge transport in sapphire and the collective excitations in superfluid helium as phonons and rotons. For sapphire, a material of growing interest in quantum information science, we develop and calculate the corresponding charge transport parameters. In this case, we incorporate anisotropic hole dynamics, polaron transport with downconversion processes of charge carriers into polarons with associated phonon emission, along with low-temperature scattering mechanisms governed by Fröhlich coupling. For superfluid helium, we implement the appropriate physics processes to describe the phonon downconversion cascade and roton downconversion into phonons, along with the propagation of those excitations. These new capabilities in G4CMP provide a foundation for simulating radiation-induced effects in cryogenic detectors, quantum information systems, and sensing applications.
