Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gate controlled resonant widths in double-bend waveguides: Bound states
  in the continuum   We consider quantum transmission through double-bend $\Pi$- and $Z$-shaped
waveguides controlled by the finger gate potential. Using the effective
non-Hermitian Hamiltonian approach we explain the resonances in transmission.
We show a difference in transmission in the short waveguides that is the result
of different chirality in $Z$ and $\Pi$ waveguides. We show that the potential
selectively affects the resonant widths resulting in the occurrence of bound
states in the continuum.

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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga