Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pair Density Wave in the Pseudogap State of High Temperature
  Superconductors   Recent scanning tunneling microscopy (STM) experiments of
Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ have shown evidence of real-space
organization of electronic states at low energies in the pseudogap state. We
argue based on symmetry considerations as well as model calculations that the
experimentally observed modulations are due to a density wave of d-wave
Cooper-pairs without global phase coherence. We show that STM measurements can
distinguish a pair-density-wave from more typical electronic modulations such
as those due to charge density wave ordering or scattering from an onsite
periodic potential.

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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph