Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Oscillations at Integer and Fractional Landau Level Indices in
  ZrTe5   A three-dimensional (3D) Dirac semimetal (DS) is an analogue of graphene, but
with linear energy dispersion in all (three) momentum directions.3D DSs have
been a fertile playground in discovering novel quantum particles, for example
Weyl fermions, in solid state systems.Many 3D DSs (e.g., ZrTe5) were
theoretically predicted. We report here the results from the studies of
aberration-corrected scanning transmission electron microscopy and low
temperature magneto-transport measurements in exfoliated ZrTe5 thin
flakes.Several unique results were observed. First, an
anomalous-Hall-effect-like behavior was observed around zero magnetic field
(B).Second, a non-trivial Berry's phase of \pi\ was obtained from the Landau
level fan diagram of the Shubnikov-de Haas oscillations in the longitudinal
resistivity. Third, the longitudinal resistivity shows linear B field
dependence in the quantum limit. Most surprisingly, quantum oscillations were
observed at fractional Landau level indices N = 2/3 and 2/5, demonstrating
strong electron-electron interactions effects in ZrTe5.

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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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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: cs
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The categories of this paper are: econ
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The categories of this paper are: patt-sol