Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors

Lolli, L.; Taralli, E.; Portesi, C.; Rajteri, M.; Monticone, E.

doi:10.3390/s16070953

Cited by 18 publications

(12 citation statements)

References 21 publications

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“…Refs. [62][63][64]). The success of these materials comes primarily from their small electron-phonon coupling and low critical temperatures, which allow for low thermal fluctuation noise, on the order of 1 aW/Hz 1/2 [65].…”

Section: Energy Resolutionmentioning

confidence: 99%

Diamond detectors for direct detection of sub-GeV dark matter

et al. 2019

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We propose to use high-purity lab-grown diamond for the detection of sub-GeV dark matter. Diamond targets can be sensitive to both nuclear and electron recoils from dark matter scattering in the MeV and above mass range, as well as to absorption processes of dark matter with masses between sub-eV to 10's of eV. Compared to other proposed semiconducting targets such as germanium and silicon, diamond detectors can probe lower dark matter masses via nuclear recoils due to the lightness of the carbon nucleus. The expected reach for electron recoils is comparable to that of germanium and silicon, with the advantage that dark counts are expected to be under better control. Via absorption processes, unconstrained QCD axion parameter space can be successfully probed in diamond for masses of order 10 eV, further demonstrating the power of our approach.

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Section: Energy Resolutionmentioning

confidence: 99%

Diamond detectors for direct detection of sub-GeV dark matter

et al. 2019

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“…The latter is an important requirement in order to suppress any unwanted Josephson contribution. The condition r = 1 can be achieved in thin bi-layers where aluminum is used in combination with other materials, such as a superconductor with lower gap as titanium (Ti) [58] or a normal metal as copper (Cu) [59]. More precisely, the gap is reduced with respect to a fully aluminum based structure due to inverse proximity effect [60].…”

Section: Heat Enginementioning

confidence: 99%

Superconducting nonlinear thermoelectric heat engine

2020

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In a previous work, we predicted that a thermally biased tunnel junction between two different superconductors can display a thermoelectric effect of nonlinear nature in the temperature gradient, under proper conditions. In this work we give a more extended discussion, and we focus on the two main features of the nonlinear contributions: i) the linear-in-bias thermoelectricity, that can be associated to a spontaneous breaking of electron-hole symmetry, ii) the strong contribution at the matching peak singularity, which is typically associated to the maximum output power and efficiency. We discuss the nonlinear origin of the thermoelectricity and its relationship with the non-linear cooling mechanism in superconducting junctions previously discussed in the literature. Finally, we design and characterize the performance of the system as a heat engine, for a realistic design and experimental parameter values. We discuss possible non-idealities demonstrating that the system is amenable to current experimental realization.

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“…An interesting prospect would be to use Al/Ti bi-layers for our TES. They have a T c which can be tuned between 0.1-1.2K [68] and for the higher T c designs have very sharp transitions. In addition, they're very fast (microsecond fall-times) and have seemingly comparable thermal conductance to tungsten, implying a Tungsten-like G but with a much lower C. Given that we're targeting lower volume, the lower resistivity wouldn't be an issue, and they have now been demonstrated to achieve good performance as a TES.…”

Section: Alternative Detector Materialsmentioning

confidence: 99%

The Low-Mass Limit: Dark Matter Detectors with eV-Scale Energy Resolution

Kurinsky

2018

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The SuperCDMS SNOLAB experiment will be a 20-kg scale Si and Ge direct dark matter detection experiment designed to probe down to 300 MeV in dark matter (DM) mass through DM-nucleus scattering and 500 keV in DM electron scattering. In order to reach these low masses with appreciable sensitivity to dark matter, it needs to achieve very low energy resolution ( 10 ev) for nuclear recoils in both detector materials, which will be achieved using a new detector design and operating mode, CDMS HV. This detector is designed to operate at a bias of 100V to convert charges liberated in our detector targets to into phonon energy in order to resolve individual electron-hole pairs. This has never before been achieved in a kg-scale detector.In this thesis, I cover three elements of the design of the CDMS HV detectors. I discuss the detector physics controlling how charges and phonons are generated in our detector crystals, comparing theory to results of recent experiments carried out at Stanford. I move on to describe the operating principles of our phonon-mediated charge readout, as well as the design of the CDMS HV detector. I then describe the performance tests of early CDMS HV prototypes in conjunction with the SuperCDMS SNOLAB electronics, and discuss the path towards achieving single electron-hole pair resolving detectors at the kg-scale given the performance obtained thus far. As a result of these tests, we were able to refine our noise and sensor dynamics models, and develop new metrics for diagnosing non-ideal sources of noise to aid in reducing coupling of the external environment to our detectors.In order to study the microphysics of phonon and charge production in our target crystals, we fabricated a number of gram-scale devices with various sensor designs in order to separate sensor and environmental e↵ects from intrinsic crystal properties. These devices provided the first successful demonstrating of using voltage to amplify charge energy by production of phonons (the Neganov-Trofimov-Luke e↵ect) in order to resolve electron-hole pairs, and opened up a new regime of dark matter and photon science at the gram-scale that we are just beginning to explore. A first dark matter search was carried out with one of these gram-scale devices, producing world-leading limits on electron-recoiling dark matter between 0.5 and 5 MeV in dark matter mass for multiple form factors. This device achieved a phonon resolution of 10 eV, allowing a single gram-day of exposure to rival kg-days of exposure in the competing liquid-noble based electron-recoil search. iv PrefaceThis thesis explores the physics of low-temperature crystals, and lays out design and testing principles for cryogenic calorimetry based on CDMS technology. Much of the text was written as the work was done, and many of the small asides or conclusions were reached as a result of discussions with collaborators. The concluding chapter represents my own opinions and conclusions about the next steps for our technology, but reflects, at the time of this writing, a general ...

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Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors

Cited by 18 publications

References 21 publications

Diamond detectors for direct detection of sub-GeV dark matter

Diamond detectors for direct detection of sub-GeV dark matter

Superconducting nonlinear thermoelectric heat engine

The Low-Mass Limit: Dark Matter Detectors with eV-Scale Energy Resolution

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