Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band engineering of a magnetic thin film rare earth monopnictide   Realizing quantum materials in few atomic layer morphologies is a key to both
observing and controlling a wide variety of exotic quantum phenomena. This
includes topological electronic materials, where the tunability and
dimensionality of few layer materials have enabled the detection of $Z_2$,
Chern, and Majorana phases. Here, we report the development of a platform for
thin film correlated, topological states in the magnetic rare-earth
monopnictide ($RX$) system GdBi synthesized by molecular beam epitaxy. This
material is known from bulk single crystal studies to be semimetallic
antiferromagnets with Neel temperature $T_N =$ 28 K and is the magnetic analog
of the non-$f$-electron containing system LaBi proposed to have topological
surface states. Our transport and magnetization studies of thin films grown
epitaxially on BaF$_2$ reveal that semimetallicity is lifted below
approximately 8 crystallographic unit cells while magnetic order is maintained
down to our minimum thickness of 5 crystallographic unit cells.
First-principles calculations show that the non-trivial topology is preserved
down to the monolayer limit, where quantum confinement and the lattice symmetry
give rise to a $C=2$ Chern insulator phase. We further demonstrate the
stabilization of these films against atmospheric degradation using a
combination of air-free buffer and capping procedures. These results together
identify thin film $RX$ materials as potential platforms for engineering
topological electronic bands in correlated magnetic materials.

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The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci