Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Gate-Defined Quantum Point Contact in an InAs Two-Dimensional Electron
  Gas   We experimentally study quantized conductance in an electrostatically defined
constriction in a high-mobility InAs two-dimensional electron gas. A parallel
magnetic field lifts the spin degeneracy and allows for the observation of
plateaus in integer multiples of $e^2/h$. Upon the application of a
perpendicular magnetic field, spin-resolved magnetoelectric subbands are
visible. Through finite bias spectroscopy we measure the subband spacings in
both parallel and perpendicular direction of the magnetic field and determine
the $g$-factor.

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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess