Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic modulation doping in topological insulators toward
  higher-temperature quantum anomalous Hall effect   Quantum anomalous Hall effect (QAHE), which generates dissipation-less edge
current without external magnetic field, is observed in magnetic-ion doped
topological insulators (TIs), such as Cr- and V-doped (Bi,Sb)2Te3. The QAHE
emerges when the Fermi level is inside the magnetically induced gap around the
original Dirac point of the TI surface state. Although the size of gap is
reported to be about 50 meV, the observable temperature of QAHE has been
limited below 300 mK. We attempt magnetic-Cr modulation doping into topological
insulator (Bi,Sb)2Te3 films to increase the observable temperature of QAHE. By
introducing the rich-Cr-doped thin (1 nm) layers at the vicinity of the both
surfaces based on non-Cr-doped (Bi,Sb)2Te3 films, we have succeeded in
observing the QAHE up to 2 K. The improvement in the observable temperature
achieved by this modulation-doping appears to be originating from the
suppression of the disorder in the surface state interacting with the rich
magnetic moments. Such a superlattice designing of the stabilized QAHE may pave
a way to dissipation-less electronics based on the highertemperature and zero
magnetic-field quantum conduction.

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The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ