Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Junctionless Cooper pair transistor   Quantum phase slip (QPS) is the topological singularity of the complex order
parameter of a quasi-one-dimensional superconductor: momentary zeroing of the
modulus and simultaneous 'slip' of the phase by 2\pi. The QPS event(s) are the
dynamic equivalent of tunneling through a conventional Josephson junction
containing static in space and time weak link(s). Here we demonstrate the
operation of a superconducting single electron transistor (Cooper pair
transistor) without any tunnel junctions. Instead a pair of thin
superconducting titanium wires in QPS regime were used. The current-voltage
characteristics demonstrate the clear Coulomb blockade with magnitude of the
Coulomb gap modulated by the gate potential. The Coulomb blockade disappears
above the critical temperature, and at low temperatures can be suppressed by
strong magnetic field.

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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th