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Charge Transport Asymmetry in Cryogenic High Purity Germanium

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Abstract

The SuperCDMS experiment relies on detection of free charges generated in high purity germanium (HPGe) crystals by particle interactions. To better understand long-term trapping effects which make carriers unavailable for such rapid ionization measurements, we used infrared LEDs (\(\lambda \) = 940 nm) to create electron-hole pairs near each face of a HPGe SuperCDMS detector operated under applied electric field at 400 mK. By alternating the polarity of an applied electric field, we were able to study propagation of each carrier through the crystal separately. Asymmetry in the resulting current transients revealed differences in trapping characteristics between electrons and holes at these low temperatures.

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Acknowledgments

This work was supported in part by the U.S. Department of Energy under Grant numbers DE-FG02-04ER41295 and DE-SC000984 and by the National Science Foundation under grant numbers PHY-0801712 and PHY-1102842. We thank many CDMS collaborators, including J. J. Yen and R. Moffatt for helpful discussions and cryogenics assistance. The team acknowledges the fabrication of this detector at the Texas A&M University under the DOE Career Grant DE-SC0004022.

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Authors and Affiliations

  1. Department of Physics, Stanford University, Stanford, CA, USA

    B. Shank, D. Q. Nagasawa, B. Cabrera, M. Cherry & B. A. Young

  2. Department of Physics and Astronomy, Texas A&M University, College Station, TX, USA

    D. Q. Nagasawa

  3. SLAC National Accelerator Center, Menlo Park, CA, USA

    M. Cherry

  4. Department of Physics, Santa Clara University, Santa Clara, CA, USA

    B. A. Young

Authors
  1. B. Shank
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  2. D. Q. Nagasawa
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  3. B. Cabrera
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  4. M. Cherry
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  5. B. A. Young
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Corresponding author

Correspondence to B. Shank.

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For the SuperCDMS Collaboration.

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Shank, B., Nagasawa, D.Q., Cabrera, B. et al. Charge Transport Asymmetry in Cryogenic High Purity Germanium. J Low Temp Phys 176, 148–154 (2014). https://doi.org/10.1007/s10909-014-1111-y

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  • DOI: https://doi.org/10.1007/s10909-014-1111-y

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