Electron transport properties in high-purity Ge down to cryogenic temperatures

Aubry-Fortuna, V.; Dollfus, P.

doi:10.1063/1.3520656

Cited by 18 publications

(28 citation statements)

References 17 publications

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“…The electron energy-momentum dispersion relationship is given by ( This chapter will proceed by describing hole propagation and scattering, electron propagation and scattering utilizing a Herring-Vogt transformation and finally electron-hole recombination. Higher order mass terms and scattering processes which occur at high electric fields are discussed elsewhere in the literature [44]. phonons [45,46] limits their speed to around the longitudinal phonon phase velocity v L .…”

Section: Charge Monte Carlomentioning

confidence: 99%

Invited Review Article: Physics and Monte Carlo techniques as relevant to cryogenic, phonon, and ionization readout of Cryogenic Dark Matter Search radiation detectors

Leman¹

2012

Review of Scientific Instruments

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This review discusses detector physics and Monte Carlo techniques for cryogenic, radiation detectors that utilize combined phonon and ionization readout. A general review of cryogenic phonon and charge transport is provided along with specific details of the Cryogenic Dark Matter Search detector instrumentation. In particular this review covers quasidiffusive phonon transport, which includes phonon focusing, anharmonic decay and isotope scattering. The interaction of phonons in the detector surface is discussed along with the downconversion of phonons in superconducting films. The charge transport physics include a mass tensor which results from the crystal band structure and is modeled with a Herring Vogt transformation. Charge scattering processes involve the creation of Neganov-Luke phonons. Transition-edge-sensor (TES) simulations include a full electric circuit description and all thermal processes including Joule heating, cooling to the substrate and thermal diffusion within the TES, the latter of which is necessary to model normal-superconducting phase separation. Relevant numerical constants are provided for these physical processes in germanium, silicon, aluminum and tungsten. Random number sampling methods including inverse cumulative distribution function (CDF) and rejection techniques are reviewed. To improve the efficiency of charge transport modeling, an additional second order inverse CDF method is developed here along with an efficient barycentric coordinate sampling method of electric fields. Results are provided in a manner that is convenient for use in Monte Carlo and references are provided for validation of these models. Contents

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Section: Charge Monte Carlomentioning

confidence: 99%

Invited Review Article: Physics and Monte Carlo techniques as relevant to cryogenic, phonon, and ionization readout of Cryogenic Dark Matter Search radiation detectors

Leman¹

2012

Review of Scientific Instruments

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“…Should carrier scattering be absent altogether, the electrons in all four energy valleys would propagate at an angle of ∼ 35 degrees to the [001] detector axis, and would then be collected by the d set of electrodes only. That such is not the case brings into light, a contrario, the importance of the scattering processes (intervalley transitions via phonon emission in the first place 4,8 ) in determining the form of the charge collection patterns. A comparison of the electron patterns in both devices shows furthermore that, in addition to lattice scattering, there is another process involved, effective at low collection fields and different by its effects from one device to the other.…”

Section: Charge Collection Patternsmentioning

confidence: 99%

“…On the other hand, the detector crystals differ by their impurity content, which strongly suggests an effect of impurity scattering, the more pronounced as the field is lower. 4 Another impurity-related effect is carrier trapping, as reflected in the h channel signal amplitudes. The latter channel measures the full collected charge, and thus registers the magnitude of the electron trapping effects, larger at low detector biases (V p < ~ 1V) in the doped compared to the ultrapure specimen (this applies to hole trapping as well).…”

Section: Charge Collection Patternsmentioning

confidence: 99%

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Transport Anisotropy and Impurity Scattering in Ge at Millikelvin Temperatures: Experimental Study

et al. 2012

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“…Measured data is from [107]. Comparison theoretical predictions are from [108,109,110]. Whether a detector is n-or p-type does not affect the DMC's charge propagation algorithms in its current iteration, which clearly represents a direction for future work.…”

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confidence: 99%

Detector Simulation and WIMP Search Analysis for the Cryogenic Dark Matter Search Experiment

McCarthy¹

2013

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Astrophysical and cosmological measurements on the scales of galaxies, galaxy clusters, and the universe indicate that ∼85% of the matter in the universe is composed of dark matter, made up of non-baryonic particles that interact with cross-sections on the weak scale or lower. Hypothetical Weakly Interacting Massive Particles, or WIMPs, represent a potential solution to the dark matter problem, and naturally arise in certain Standard Model extensions.The Cryogenic Dark Matter Search (CDMS) collaboration aims to detect the scattering of WIMP particles from nuclei in terrestrial detectors. Germanium and silicon particle detectors are deployed in the Soudan Underground Laboratory in Minnesota. These detectors are instrumented with phonon and ionization sensors, which allows for discrimination against electromagnetic backgrounds, which strike the detector at rates orders of magnitude higher than the expected WIMP signal.This dissertation presents the development of numerical models of the physics of the CDMS detectors, implemented in a computational package collectively known as the CDMS Detector Monte Carlo (DMC). After substantial validation of the models against data, the DMC is used to investigate potential backgrounds to the next iteration of the CDMS experiment, known as SuperCDMS. Finally, an investigation of using the DMC in a reverse Monte Carlo analysis of WIMP search data is presented.140.23 kg-days of WIMP search data from the silicon detectors in the CDMSII experiment is also analyzed. The resulting upper limits on the WIMP-nucleon crosssection are higher than those published by other experiments at all WIMP masses, and the lowest limit on the WIMP-nucleon cross-section is 1.07*10 −42 cm 2 at a mass 3 of 60 GeV/c 2 . These results do provide new and interesting constraints at WIMP masses ≤40 GeV/c 2 and cross sections from 10 −42 -10 −39 cm 2 , a region in which some WIMP search experiments have claimed evidence for a WIMP signal, which other experiments claim to have ruled out.

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Electron transport properties in high-purity Ge down to cryogenic temperatures

Cited by 18 publications

References 17 publications

Invited Review Article: Physics and Monte Carlo techniques as relevant to cryogenic, phonon, and ionization readout of Cryogenic Dark Matter Search radiation detectors

Invited Review Article: Physics and Monte Carlo techniques as relevant to cryogenic, phonon, and ionization readout of Cryogenic Dark Matter Search radiation detectors

Transport Anisotropy and Impurity Scattering in Ge at Millikelvin Temperatures: Experimental Study

Detector Simulation and WIMP Search Analysis for the Cryogenic Dark Matter Search Experiment

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