Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental realization of a Coulomb blockade refrigerator   We present an experimental realization of a Coulomb blockade refrigerator
(CBR) based on a single - electron transistor (SET). In the present structure,
the SET island is interrupted by a superconducting inclusion to permit charge
transport while preventing heat flow. At certain values of the bias and gate
voltages, the current through the SET cools one of the junctions. The
measurements follow theoretical model down to about 80 mK, which was the base
temperature of the current measurements. The observed cooling increases rapidly
with decreasing temperature in agreement with the theory, reaching about 15 mK
drop at the base temperature. CBR appears as a promising electronic cooler at
temperatures well below 100 mK.

16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio