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Transport Anisotropy and Impurity Scattering in Ge at Millikelvin Temperatures: Experimental Study
Olivieri E., Domange J., Dumoulin L., Marnieros S., Broniatowski A.
Dans Journal of Low Temperature Physics - 14th International Workshop on Low Temperature Detectors, Heidelberg : Allemagne (2011) - http://hal.in2p3.fr/in2p3-00674825
Physique/Physique/Instrumentations et Détecteurs
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Physique/Matière Condensée/Autre
Transport Anisotropy and Impurity Scattering in Ge at Millikelvin Temperatures: Experimental Study
E. Olivieri1, J. Domange1, 2, L. Dumoulin1, S. Marnieros1, A. Broniatowski1
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
http://www-csnsm.in2p3.fr/
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
France
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
CEA : DSM/IRFU
France
CSNSM PS1
Anisotropy effects in hot carrier transport have been investigated in germanium crystals at mK temperatures in the electric field range pertaining to the operation of the Edelweiss dark matter detectors. Comparative measurements have been made on n-type specimens of different impurity contents, both ultra-pure (Nd-Na < 1010 cm-3) and doped to 1011 cm-3. At relatively high field intensities (>  5 V/cm), similar features of electron and hole transport are observed independent of the concentration of electrically active impurities. Differences appear at lower field (down to a fraction of a V/cm) with regard to electron straggling especially, dependent on crystal purity. These experiments demonstrate the importance on carrier transport of impurity scattering at low field, whereas phonon scattering becomes the dominant factor at higher field intensities.

Communications avec actes
2012
2011
Journal of Low Temperature Physics
internationale
167
1137-1142

14th International Workshop on Low Temperature Detectors
Heidelberg
Allemagne
01/08/2011
05/08/2011
A. Broniatowski

CSNSM PS1
72.20.Ht, 29.40.Wk, 95.35.+d, 07.20.Mc
Dark matter – cryogenic germanium detector – carrier anisotropy
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10.1007-s10909-012-0548-0.pdf(222.2 KB)