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Title: Thermal detection of single e-h pairs in a biased silicon crystal detector

Journal Article · · Applied Physics Letters
DOI: https://doi.org/10.1063/1.5010699 · OSTI ID:1424717
 [1];  [2];  [3];  [2];  [1]; ORCiD logo [3];  [1]; ORCiD logo [2]; ORCiD logo [1];  [4];  [2];  [1];  [1];  [5]
  1. Stanford Univ., CA (United States). Dept. of Physics
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Inst.for Particle Astrophysics and Cosmology
  3. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Inst.for Particle Astrophysics and Cosmology
  4. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  5. Santa Clara Univ., Santa Clara, CA (United States). Dept. of Physics

We demonstrate that individual electron-hole pairs are resolved in a 1 cm2 by 4 mm thick silicon crystal (0.93 g) operated at ~35 mK. One side of the detector is patterned with two quasiparticle-trap-assisted electro-thermal-feedback transition edge sensor arrays held near ground potential. The other side contains a bias grid with 20% coverage. Bias potentials up to ±160 V were used in the work reported here. A fiber optic provides 650 nm (1.9 eV) photons that each produce an electron-hole (eh+) pair in the crystal near the grid. The energy of the drifting charges is measured with a phonon sensor noise σ ~0.09 e h+ pair. In conclusion, the observed charge quantization is nearly identical for h+s or es transported across the crystal.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1424717
Alternate ID(s):
OSTI ID: 1417769
Journal Information:
Applied Physics Letters, Vol. 112, Issue 4; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 47 works
Citation information provided by
Web of Science

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Direct detection of strongly interacting sub-GeV dark matter via electron recoils journal September 2019
SENSEI: First Direct-Detection Constraints on sub-GeV Dark Matter from a Surface Run text January 2018
First Dark Matter Constraints from a SuperCDMS Single-Charge Sensitive Detector text January 2018
Diamond Detectors for Direct Detection of Sub-GeV Dark Matter text January 2019
Direct Detection of Strongly Interacting Sub-GeV Dark Matter via Electron Recoils text January 2019
On the relation between Migdal effect and dark matter-electron scattering in isolated atoms and semiconductors text January 2019
Modeling of Impact Ionization and Charge Trapping in SuperCDMS HVeV Detectors text January 2019

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