Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Emergent continuous symmetry in anisotropic flexible two-dimensional
  materials   We develop the theory of anomalous elasticity in two-dimensional flexible
materials with orthorhombic crystal symmetry. Remarkably, in the universal
region, where characteristic length scales are larger than the rather small
Ginzburg scale ${\sim} 10\, {\rm nm}$, these materials possess an infinite set
of flat phases which are connected by emergent continuous symmetry. This hidden
symmetry leads to the formation of a stable line of fixed points corresponding
to different phases. The same symmetry also enforces power law scaling with
momentum of the anisotropic bending rigidity and Young's modulus, controlled by
a single universal exponent -- the very same along the whole line of fixed
points. These anisotropic flat phases are uniquely labeled by the ratio of
absolute Poisson's ratios. We apply our theory to monolayer black phosphorus
(phosphorene).

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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-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: physics
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph