Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological Excitations of Hidden Order in URu$_2$Si$_2$ Under Extreme
  Electric Fields   Quantum materials are epitomized by the influence of collective modes upon
their macroscopic properties. Relatively few examples exist, however, whereby
coherence of the ground-state wavefunction directly contributes to the
conductivity. Notable examples include the quantizing effects of high magnetic
fields upon the 2D electron gas, the collective sliding of charge density waves
subject to high electric fields, and perhaps most notably the macroscopic phase
coherence that enables superconductors to carry dissipationless currents. Here
we reveal that the low temperature hidden order state of URu$_2$Si$_2$ exhibits
just such a connection between the quantum and macroscopic worlds -- under
large voltage bias we observe non-linear contributions to the conductivity that
are directly analogous to the manifestation of phase slips in one-dimensional
superconductors [1], suggesting a complex order parameter for hidden order

13
The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph