Phonon Wind Effects on Charge Collection in Cryogenic Ge Detectors for Rare Event Searches at Low Energies

Experimental data are presented for the charge collection efficiency for near-electrode interactions in cryogenic germanium detectors, and analyzed in terms of a model involving a phonon wind-driven expansion of the electron-hole cloud generated at the site of energy deposition. Computer simulations...

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Bibliographic Details
Published in:Journal of low temperature physics 2022-11, Vol.209 (3-4), p.308-313
Main Authors: Broniatowski, A., Marnieros, S., Dumoulin, L.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Charge efficiency
Condensed Matter Physics
Data Analysis, Statistics and Probability
Depth profiling
Detectors
Electrodes
Germanium
Holes (electron deficiencies)
Instrumentation and Detectors
Low temperature physics
Magnetic Materials
Magnetism
Phonons
Physics
Physics and Astronomy
Wind effects
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Summary:Experimental data are presented for the charge collection efficiency for near-electrode interactions in cryogenic germanium detectors, and analyzed in terms of a model involving a phonon wind-driven expansion of the electron-hole cloud generated at the site of energy deposition. Computer simulations reproduce to an excellent accuracy the collection depth profiles as obtained by experiment and their dependence on the collection field and the nature of the electrode. Electrode-dependent effects in particular are explained by differences in the phonon reflection properties at the interface of the Ge crystal and the electrode.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-022-02817-6