Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of high-temperature quantum anomalous Hall regime in
  intrinsic MnBi$_2$Te$_4$/Bi$_2$Te$_3$ superlattice   The quantum anomalous Hall effect is a fundamental transport response of a
topologically non-trivial system in zero magnetic field. Its physical origin
relies on the intrinsically inverted electronic band structure and
ferromagnetism, and its most consequential manifestation is the
dissipation-free flow of chiral charge currents at the edges that can
potentially transform future quantum electronics. Here we report a previously
unknown Berry-curvature-driven anomalous Hall regime ('Q-window') at
above-Kelvin temperatures in the magnetic topological bulk crystals where
through growth Mn ions self-organize into a period-ordered
MnBi$_2$Te$_4$/Bi$_2$Te$_3$ superlattice. Robust ferromagnetism of the
MnBi$_2$Te$_4$ monolayers opens a large surface gap, and anomalous Hall
conductance reaches an $e^2/h$ quantization plateau when the Fermi level is
tuned into this gap within a Q-window in which the anomalous Hall conductance
from the bulk is to a high precision zero. The quantization in this new regime
is not obstructed by the bulk conduction channels and thus should be present in
a broad family of topological magnets.

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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
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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: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol