Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Onset field for Fermi-surface reconstruction in the cuprate
  superconductor YBCO   Quantum oscillations and negative Hall and Seebeck coefficients at low
temperature and high magnetic field have shown the Fermi surface of underdoped
cuprates to contain a small closed electron pocket. It is thought to result
from a reconstruction by charge order, but whether it is the order seen by NMR
and ultrasound above a threshold field or the short-range modulations seen by
X-ray diffraction in zero field is unclear. Here we use measurements of the
thermal Hall conductivity in YBCO to show that Fermi-surface reconstruction
occurs only above a sharply defined onset field, equal to the transition field
seen in ultrasound. This reveals that electrons do not experience long-range
broken translational symmetry in the zero-field ground state, and hence in zero
field there is no quantum critical point for the onset of charge order as a
function of doping.

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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: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
13
The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cs