Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement in surface mobility and quantum transport of
  Bi_(2-x)Sb_(x)Te_(3-y)Se_(y) topological insulator by controlling the crystal
  growth conditions   Despite numerous studies on three-dimensional topological insulators (3D
TIs), the controlled growth of high quality (bulk-insulating and high mobility)
TIs remains a challenging subject. This study investigates the role of growth
methods on the synthesis of single crystal stoichiometric BiSbTeSe2 (BSTS).
Three types of BSTS samples are prepared using three different methods, namely
melting growth (MG), Bridgman growth (BG) and two-step melting-Bridgman growth
(MBG). Our results show that the crystal quality of the BSTS depend strongly on
the growth method. Crystal structure and composition analyses suggest a better
homogeneity and highly-ordered crystal structure in BSTS grown by MBG method.
This correlates well to sample electrical transport properties, where a
substantial improvement in surface mobility is observed in MBG BSTS devices.
The enhancement in crystal quality and mobility allow the observation of
well-developed quantum Hall effect at low magnetic field.

9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess