Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The anomalous Hall Effect in a Magnetically Extended Topological
  Insulator Heterostructure   Constructing heterostructures of a topological insulator (TI) with an undoped
magnetic insulator (MI) is a clean and versatile approach to break the
time-reversible symmetry in the TI surface states. Despite a lot of efforts,
the strength of interfacial magnetic proximity effect (MPE) is still too weak
to achieve the quantum anomalous Hall effect and many other topological quantum
phenomena. Recently, a new approach based on intercalation of atomic layers of
MI, referred to as magnetic extension, was proposed to realize strong MPE [2D
Mater. 4, 025082(2017)]. Motivated by this proposal, here, we study a magnetic
extension system prepared by molecular beam epitaxy growth of MnSe thin films
on topological insulator (Bi,Sb)2Te3. Direct evidence is obtained for
intercalation of MnSe atomic layer into a few quintuple layers of (Bi,Sb)2Te3,
forming either a double magnetic septuple layer (SL) or an isolated single SL
at the interface, where one SL denotes a van der Waals building block
consisting of B-A-B-Mn-B-A-B (A=Bi1-xSbx, B= Te1-ySey). The two types of
interfaces (namely TI/mono-SL and TI/bi-SL) have different MPE, which is
manifested as distinctively different transport behaviors. Specifically, the
mono-SL induces a spinflip transition with a sharp change at small magnetic
field in the anomalous Hall effect of TI layers, while the bi-SL induces a
spin-flop transition with a slow change at large field. Our work demonstrates a
useful platform to realize the full potential of the magnetic extension
approach for pursuing novel topological physics and related device
applications.

15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin