Matthew Herbst

Matthew Herbst
Aalto University · Low Temperature Laboratory

Doctor of Philosophy
Developing optomechanical systems to investigate gravity at small scales.

About

8
Publications
694
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18
Citations
Introduction
I am a Postdoc at the Low Temperature Laboratory at Aalto, where I work on optomechanical systems and sensitive gravity detectors. Other topics of interest include cryogenic X-ray detectors, complex magnetic materials at low T, and noise in superconducting microstructures.

Publications

Publications (8)
Article
Full-text available
The specific heat of dilute alloys of holmium in gold and in silver plays a major role in the optimization of low temperature microcalorimeters with enclosed 163Ho, such as the ones developed for the neutrino mass experiment ECHo. We investigate alloys with atomic concentrations of xHo=0.01-4% at temperatures between 10 and 800mK. Due to the large...
Article
Full-text available
Using dilute silver erbium alloys as a paramagnetic temperature sensor in metallic magnetic calorimeters (MMCs) has the advantage of the host material not having a nuclear quadrupole moment, in contrast to the alternative of using gold erbium alloys. We present numerical calculations of the specific heat and magnetization of Ag:Er, which are necess...
Article
Full-text available
The performance of superconducting devices like qubits, superconducting quantum interference devices (SQUIDs), and particle detectors is often limited by finite coherence times and 1/f noise. Various types of slow fluctuators in the Josephson junctions and the passive parts of these superconducting circuits can be the cause, and devices usually suf...
Thesis
Magnetic micro-calorimeters (MMCs) are cryogenic particle detectors well suited for high-precision X-ray spectroscopy. They measure the temperature rise caused by an X-ray impact via the change in magnetization of a paramagnetic temperature sensor. Until now, MMCs have been designed to operate at around 20mK, requiring sophisticated cooling, which...
Preprint
Full-text available
The performance of superconducting devices like qubits, SQUIDs, and particle detectors is often limited by finite coherence times and 1/f noise. Various types of slow fluctuators in the Josephson junctions and the passive parts of these superconducting circuits can be the cause, and devices usually suffer from a combination of different noise sourc...
Article
When considering fine details, X-ray emission spectra present a structure that is quite complex over a quite wide energy window. Its systematic exhaustive study, until recently, has been hindered in...
Preprint
Full-text available
The specific heat of dilute holmium alloys plays a major role in the optimization of low temperature microcalorimeters with enclosed $^{163}\textrm{Ho}$, such as the ones developed for the neutrino mass experiment ECHo. We investigate alloys with atomic concentrations of $x_\textrm{Ho}=0.01\,\% - 4\,\%$ at temperatures between $10\,\textrm{mK}$ and...

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