Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A two-dimensional electron gas at the (001) surface of ferromagnetic
  EuTiO$_{3}$(001)   Studies on oxide quasi-two dimensional electron gas (q2DEG) have been a
playground for the discovery of novel and sometimes unexpected phenomena, like
the reported magnetism at the surface and at the interface between LaAlO$_{3}$
and SrTiO$_{3}$ non-magnetic materials. However, magnetism in this system is
weak and there are evidences of a not intrinsic origin. Here, by using in-situ
high-resolution angle resolved photoemission we demonstrate that ferromagnetic
EuTiO$_{3}$, the magnetic counterpart of SrTiO$_{3}$ in the bulk, hosts a q2DEG
at its (001) surface. This is confirmed by density functional theory
calculations with Hubbard U terms in the presence of oxygen divacancies in
various configurations, all of them leading to a spin-polarized q2DEG related
to the ferromagnetic order of Eu-4f magnetic moments. The results suggest
EuTiO$_{3}$(001) as a new material platform for oxide q2DEGs, characterized by
broken inversion and time reversal symmetries.

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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int