Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous quantum Griffiths singularity in ultrathin crystalline lead
  films   We study the magnetic field induced superconductor-metal transition (SMT) in
ultrathin crystalline Pb films. By performing ultralow temperature transport
measurement, the divergent critical exponent as an indication of quantum
Griffiths singularity (QGS) is observed when approaching zero temperature
quantum critical point. Distinctively, the phase boundary of SMT exhibits an
anomalous behavior in low temperature regime that the onset critical field
decreases with decreasing temperatures, which distinguishes our observation
from earlier reports of QGS in various two-dimensional superconductors. We
demonstrate that this observed anomalous phase boundary has its origin from the
superconducting fluctuations in ultrathin Pb films. Our findings reveal a novel
aspect of the QGS of SMT in two-dimentional superconducting systems with
anomalous phase boundary.

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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: bayes-an