Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconducting transition edge sensors with phononic thermal isolation   The sensitivity of a low-noise superconducting transition edge sensor (TES)
is determined by the thermal conductance of the support structure that connects
the active elements of the device to the heat bath. Low-noise devices require
conductances in the range 0.1 to 10 pWK$^{-1}$, and so have to rely on
diffusive phonon scattering in long, narrow, amorphous SiN$_\text{x}$ legs. We
show that it is possible to manufacture and operate TESs having short,
ballistic low-dimensional legs (cross section 500$\times$200 nm) that contain
multi-element phononic interferometers and ring resonators. These legs
transport heat in effectively just 5 elastic modes at the TES's operating
temperature (< 150 mK), which is close to the quantised limit of 4. The
phononic filters then reduce the thermal flux further by frequency-domain
filtering. For example, a micromachined 3-element ring resonator reduced the
flux to 19 % of a straight-legged ballistic device operating at the quantised
limit, and 38 % of a straight-legged diffusive reference device. This work
opens the way to manufacturing TESs where performance is determined entirely by
filtered, few-mode, ballistic thermal transport in short, low-heat capacity
legs, free from the artifacts of two level systems.

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The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ