Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Role of Time-Reversal Symmetry in the Dynamical Response of "One-Way"
  Nonlinear Devices   We study the role of time-reversal symmetry on the dynamical response of
nonlinear optical systems that behave as unidirectional ("one-way") devices. It
is shown that lossless nonlinear materials, despite being nonreciprocal, are
typically time-reversal invariant. This property raises an apparent paradox
because time-reversal invariant systems are forcibly bi-directional. Here, we
present a solution for this conundrum, and theoretically explain why the
"one-way" behavior can indeed be compatible with the time-reversal invariance.
It is found that in the time-reversed problem the incident waves have a
variation in time that is generally incompatible with the adiabatic
approximation. Due to this reason the adiabatic approximation fails to predict
the bi-directional nature of nonlinear system. We discuss the implications of
this finding in the performance of practical nonlinear "one-way" devices.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph