Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In-plane critical magnetic fields in magic-angle twisted trilayer
  graphene   It has recently been shown that superconductivity in magic-angle twisted
trilayer graphene survives to in-plane magnetic fields that are well in excess
of the Pauli limit, and much stronger than the in-plane critical magnetic
fields of magic-angle twisted bilayer graphene. The difference is surprising
because twisted bilayers and trilayers both support the magic-angle flat bands
thought to be the fountainhead of twisted graphene superconductivity. We show
here that the difference in critical magnetic fields can be traced to a
$\mathcal{C}_2 \mathcal{M}_{h}$ symmetry in trilayers that survives in-plane
magnetic fields, and also relative displacements between top and bottom layers
that are not under experimental control at present. An gate electric field
breaks the $\mathcal{C}_2 \mathcal{M}_{h}$ symmetry and therefore limits the
in-plane critical magnetic field.

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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg