Abstract
The Cryogenic Dark Matter Search (CDMS) measures both the ionized charge and the energy in athermal phonons created by particle interactions in ultrapure germanium and silicon crystals at a temperature of 40 mK. Charge collection potentials must remain at only a few volts, else emitted phonons from drifted carriers will dominate the phonons of the original interaction. At these drift fields, there are practically no thermal phonons and carrier transport is determined by phonon emission.
We present results for drift-limited carrier dynamics and rates of phonon emission in 〈100〉 germanium. As these transport conditions represent an extreme limit, a Monte Carlo technique was used to bypass analytical assumptions commonly used in solving the Boltzmann transport equation. This work will assist us in understanding phenomena found in our detectors.
Similar content being viewed by others
References
C. Jacoboni, P. Lugli, The Monte Carlo Method for Semiconductor Device Simulation (Springer, New York, 1989)
C. Jacoboni, L. Reggiani, Rev. Mod. Phys. 55, 645 (1983)
C. Jacoboni, F. Nava, C. Canali, G. Ottaviani, Phys. Rev. B 24, 1014 (1981)
L. Reggiani, C. Canali, F. Nava, G. Ottaviani, Phys. Rev. B 16, 2781 (1977)
M. Lundstrom, Fundamentals of Carrier Transport, 2nd edn. (Cambridge University Press, Cambridge, 2000)
B.K. Ridley, Quantum Process in Semiconductors, 4th edn. (Clarendon Press, Oxford, 1999), pp. 82–115
T. Brudevoll, T. Fjeldly, J. Baek, M. Shur, J. Appl. Phys. 67, 7373 (1990)
B. Censier, Etude et optimisation de la voie ionisation dans l’experience Edelweiss, Ph.D. defense, IPN Orsay, 2006
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sundqvist, K.M., Sadoulet, B. Detectors of the Cryogenic Dark Matter Search: Charge Transport and Phonon Emission in Ge 〈100〉 Crystals at 40 mK. J Low Temp Phys 151, 443–447 (2008). https://doi.org/10.1007/s10909-007-9666-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10909-007-9666-5