Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modulation of crystal and electronic structures in topological
  insulators by rare-earth doping   We study magnetotransport in a rare earth doped topological insulator,
Sm0.1Sb1.9Te3 single crystals, under magnetic fields up to 14 T. It is found
that that the crystals exhibit Shubnikov de Haas oscillations in their
magneto-transport behaviour at low temperatures and high magnetic fields. The
SdH oscillations result from the mixed contributions of bulk and surface
states. We also investigate the SdH oscillations in different orientations of
the magnetic field, which reveals a three dimensional Fermi surface topology.
By fitting the oscillatory resistance with the Lifshitz Kosevich theory, we
draw a Landau-level fan diagram that displays the expected nontrivial phase. In
addition, the density functional theory calculations shows that Sm doping
changes the crystal structure and electronic structure compared with pure
Sb2Te3. This work demonstrates that rare earth doping is an effective way to
manipulate the Fermi surface of topological insulators. Our results hold
potential for the realization of exotic topological effects in magnetic
topological insulators.

15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin