Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The D3-probe-D7 brane holographic fractional topological insulator   The D3-probe-D7 brane system, oriented so as to have 2+1-dimensional Poincare
symmetry, is argued to be the holographic representation of a strongly
correlated fractional topological insulator which exhibits a zero-field
quantized Hall effect with half-units of Hall conductivity. The phase diagram
of the system with charge density and external magnetic field is found and, as
well as charge gapped quantum Hall states, it exhibits metallic and
semi-metallic phases with interesting behaviours. The relationship of this to
other models of fractional topological insulators is discussed.

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The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ