Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density wave like transport anomalies in surface doped Na$_{2}$IrO$_3$   We report that the surface conductivity of Na$_{2}$IrO$_3$ crystal is
extremely tunable by high energy Ar plasma etching and can be tuned from
insulating to metallic with increasing etching time. Temperature dependent
electrical transport for the metallic samples show signatures of first order
phase transitions which are consistent with charge or spin density wave like
phase transitions recently predicted theoretically. Additionally,
grazing-incidence small-angle x-ray scattering (GISAXS) reveal that the room
temperature surface structure of Na$_{2}$IrO$_3$ does not change after plasma
etching.

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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
2
The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin