Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fluctuations and Pinning for Individually Manipulated Skyrmions   We numerically examine the dynamics of individually dragged skyrmions
interacting simultaneously with an array of other skyrmions and quenched
disorder. For drives just above depinning, we observe a broad band noise signal
with a $1/f$ characteristic, while at higher drives, narrow band or white noise
appears. Even in the absence of quenched disorder, the threshold force that
must be applied to translate the driven skyrmion is finite due to elastic
interactions with other skyrmions. The depinning threshold increases as the
strength of the quenched disorder is raised. Above the depinning force, the
skyrmion moves faster in the presence of quenched disorder than in a
disorder-free system since the pinning sites prevent other skyrmions from being
dragged along with the driven skyrmion. For strong pinning, we find a
stick-slip motion of the driven skyrmion which produces a telegraph noise
signature. The depinning threshold increases monotonically with skyrmion
density in the absence of quenched disorder, but when pinning is present, the
depinning threshold changes nonmonotonically with skyrmion density and there
are reentrant pinned phases due to a competition between pinning induced by the
quenched disorder and that produced by the elastic interactions of the skyrmion
lattice.

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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an