Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fractional topological insulators of Cooper pairs induced by proximity
  effect   Certain insulating materials with strong spin-orbit coupling can conduct
currents along their edges or surfaces. This phenomenon arises from the
non-trivial topological properties of the electronic band-structure, and is
somewhat similar to the integer quantum Hall effect of electrons in strong
magnetic fields. Topological insulators analogous to the fractional quantum
Hall effect are also possible, but have not yet been observed in any material.
Here we show that a quantum well made from a topological band insulator such as
Bi2Se3 or Bi2Te3, placed in contact with a superconductor, can be used to
realize a two-dimensional topological state with macroscopic many-body quantum
entanglement whose excitations carry fractional amounts of electron's charge
and spin. This fractional topological insulator is a "pseudogap" state of
induced spinful p-wave Cooper pairs, fundamentally significant to quantum field
theory and applicable to spintronic devices and quantum computing.

20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con