Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence of Cooper pair pumping with combined flux and voltage control   We have experimentally demonstrated pumping of Cooper pairs in a
single-island mesoscopic structure. The island was connected to leads through
SQUID (Superconducting Quantum Interference Device) loops. Synchronized flux
and voltage signals were applied whereby the Josephson energies of the SQUIDs
and the gate charge were tuned adiabatically. From the current-voltage
characteristics one can see that the pumped current increases in 1e steps which
is due to quasiparticle poisoning on the measurement time scale, but we argue
that the transport of charge is due to Cooper pairs.

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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: nucl-th