Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray tools for van der Waals epitaxy of bismuth telluride topological
  insulator films   Potential applications in spintronics and quantum computing have motivated
much recent research in epitaxial films of bismuth telluride. This system is
also an example of van der Waals (vdW) epitaxy where the interface coherence
between film and substrate is based on vdW bonds instead of strong ionic or
covalent bonds. Effects of lattice mismatch on electrical properties and film
structure are more difficult to control due to the weakness of the vdW forces.
Here we present a general x-ray diffraction method to investigate in-plane
atomic displacements and lateral lattice coherence length in vdW epitaxy. The
method is demonstrated in a series of films grown at different temperatures and
pressures of additional tellurium sources, revealing strong intercorrelations
between the lateral features as well as with the n/p-types of free charge
carries.

15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio